diff --git a/BUILD_PLAN.md b/BUILD_PLAN.md
index b443df6..5f97ba5 100644
--- a/BUILD_PLAN.md
+++ b/BUILD_PLAN.md
@@ -34,16 +34,22 @@ ahead; realtime/media must not jump ahead of the actor and access contracts.
 
 ## M0 — contracts and provenance
 
-Status: **in progress**.
+Status: **implemented**.
 
 - Tera/Spaces is the renderer; `lumbridgecorp` is the control plane.
 - Apache-2.0 remains the outbound code license.
 - Every copied asset/data item gets a pinned source, license, hash, and intake
   note. Original procedural assets record their design lineage.
-- Add an automated asset-manifest gate, dependency license allowlist, and SBOM.
+- `PROVENANCE.json` plus `npm run provenance` hash-gates every tracked
+  distribution artifact, rejects undeclared copied items and remote/bundled
+  fonts, and records original procedural/data lineage.
+- `npm run licenses` enforces the reviewed dependency-license allowlist and
+  registry integrity pins; `npm run sbom` emits SPDX 2.3 from the lockfile.
 
 Exit gate: a clean clone builds and tests without private services or binary
-art; every shipped dependency, route, font, and asset has recorded provenance.
+runtime art; every shipped dependency, route, font, and asset has recorded
+provenance. The only tracked raster art is the two generated social cards in
+`public/`, both source-reproducible and SHA-256 pinned in the manifest.
 
 ## M1 — California roads and passive Model X traffic
 
@@ -78,8 +84,9 @@ tunneling, or tab-resume jumps; a recorded input trace replays identically.
 
 ## M3 — walkable offices and actors
 
-Status: **collision/controller foundation and procedural actor assets
-implemented; office camera/input integration and identity handoff pending**.
+Status: **implemented and integrated**. City actors and office walkers share the
+same profile-derived appearance and journey identity; anonymous visitors change
+from crow outdoors to dog indoors, while signed-in members remain humanoid.
 
 - First-/third-person walker against the existing `Plan.blocked` wall segments.
 - Door traversal and city ↔ office identity handoff.
@@ -93,6 +100,13 @@ soak produces no stuck or out-of-bounds actor.
 
 ## M4 — authoritative multiplayer
 
+Status: **core hosted actor, vehicle, and aircraft presence is implemented**.
+The service uses short-lived rotating grants, exact interest cells, bounded
+10 Hz publishing, strict motion validation, reconnect snapshots, and aggregate-
+only presence UI. Deterministic two-client and bounded-service acceptance tests
+cover convergence, late join, cell isolation, ownership, revocation, cleanup,
+and speed-hack rejection.
+
 - Dedicated realtime session service; do not merge it into the control plane.
 - Server-authoritative actor/vehicle poses, input validation, interpolation,
   reconnect, and interest zones keyed by Tera cell / Office / Floor / Room.
@@ -128,6 +142,11 @@ textures; bandwidth adaptation and safe public placeholders work.
 
 ## M7 — playable aircraft
 
+Status: **solo and hosted multiplayer play are implemented**. The original
+procedural electric V-tail has deterministic assisted/manual control, chase
+camera, California bounds, and an authoritative geographic wire adapter; remote
+clients render its bank, control surfaces, and fan phase from validated state.
+
 Keep today's aircraft ambient until vehicle, actor, camera, and network
 abstractions are proven. A later `PlayableAircraft` reuses flight-source data for
 the world but owns a separate controller and authority model.
diff --git a/NOTICE b/NOTICE
index 1eb4a2d..0cff6bc 100644
--- a/NOTICE
+++ b/NOTICE
@@ -85,6 +85,10 @@ THIRD-PARTY DEPENDENCIES
 three.js — MIT License — Copyright (c) 2010-2026 three.js authors
   https://github.com/mrdoob/three.js
 
+satellite.js — MIT License — Copyright (C) 2013 Shashwat Kandadai,
+UCSC Jack Baskin School of Engineering
+  https://github.com/shashwatak/satellite-js
+
 Build tooling (Vite, TypeScript, esbuild) is a development dependency only and
 is not redistributed in built output.
 
diff --git a/PROVENANCE.json b/PROVENANCE.json
new file mode 100644
index 0000000..0c82d30
--- /dev/null
+++ b/PROVENANCE.json
@@ -0,0 +1,86 @@
+{
+  "schemaVersion": 1,
+  "projectLicense": "Apache-2.0",
+  "policies": {
+    "copiedItems": "Every copied item requires an immutable upstream source, exact upstream path, SPDX license, SHA-256, intake date, and review note.",
+    "fonts": "System font stacks only; no bundled font files or remote font services.",
+    "runtimeArt": "Runtime meshes and textures are generated from reviewable source. Binary art is not permitted under src/.",
+    "researchReferences": "Evaluated references that were not copied are recorded in ASSET_RESEARCH.md and are not distributed artifacts."
+  },
+  "distributedArtifacts": [
+    {
+      "path": "public/og-office.png",
+      "kind": "generated-social-card",
+      "origin": "repository-generated",
+      "license": "Apache-2.0",
+      "sha256": "5906c7ef22175307f18984525ae5c7bd7fe6f40eb2652a850d3cb44b44ba8228",
+      "generator": "scripts/brand-assets/capture.mjs",
+      "inputs": ["scripts/brand-assets/capture.mjs", "scripts/brand-assets/og.html"],
+      "intakeDate": "2026-08-06",
+      "intakeNote": "Generated from this repository's built office scene and local card template by the documented capture workflow; no external image was copied."
+    },
+    {
+      "path": "public/og-tera.png",
+      "kind": "generated-social-card",
+      "origin": "repository-generated",
+      "license": "Apache-2.0",
+      "sha256": "decfd9b70c0416baf47b0484040079c7f2aaa7bb8a60cf5add7a3069eac05277",
+      "generator": "scripts/brand-assets/capture.mjs",
+      "inputs": ["scripts/brand-assets/capture.mjs", "scripts/brand-assets/og.html"],
+      "intakeDate": "2026-08-06",
+      "intakeNote": "Generated from this repository's built California scene and local card template by the documented capture workflow; no external image was copied."
+    }
+  ],
+  "proceduralLineage": [
+    {
+      "path": "src/assets/",
+      "kind": "procedural-vehicles-actors-office-kit-and-textures",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "outputLicense": "CC0-1.0",
+      "lineage": "ASSET_RESEARCH.md and src/assets/LICENSE-ART document the original primitive grammar, design references, and artistic-output dedication."
+    },
+    {
+      "path": "src/aircraft/asset.ts",
+      "kind": "procedural-aircraft",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "lineage": "Original code-composed aircraft silhouette; repository originality and aircraft-data boundaries are documented in NOTICE."
+    },
+    {
+      "path": "src/engine/",
+      "kind": "procedural-map-environment-buildings-and-data-glyphs",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "lineage": "Original cached unit-primitive rendering grammar documented in ASSET_RESEARCH.md and ARCHITECTURE.md; live data is converted to original glyph geometry rather than bundled as art."
+    },
+    {
+      "path": "src/interiors/",
+      "kind": "procedural-office-shells-and-presentation",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "lineage": "Original office shell and scene composition over the validated authored packs; geometry is built at runtime from reviewable source and primitive assets."
+    },
+    {
+      "path": "src/cities/",
+      "kind": "authored-city-geography",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "lineage": "Original hand-traced city geometry with the non-OSM data boundary documented in NOTICE and source headers."
+    },
+    {
+      "path": "src/offices/",
+      "kind": "authored-office-packs",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "lineage": "Repository-authored office plans; each pack carries explicit author and license metadata under the validated office-pack contract."
+    },
+    {
+      "path": "src/transport/california.ts",
+      "kind": "authored-road-and-route-data",
+      "origin": "original",
+      "sourceLicense": "Apache-2.0",
+      "lineage": "Original coarse simulation graph; every node, segment, route, and anchor carries a provenance field validated by tests."
+    }
+  ]
+}
diff --git a/README.md b/README.md
index e3e49a1..100b29f 100644
--- a/README.md
+++ b/README.md
@@ -115,7 +115,10 @@ Two rules, and they are not stylistic:
 - **Do not commit logos or brand assets.** They are trademarks, not code.
 
 See [ARCHITECTURE.md](ARCHITECTURE.md) §3 for the full reasoning, and
-[NOTICE](NOTICE) for the attribution and data-provenance statement.
+[NOTICE](NOTICE) for the attribution and data-provenance statement, and
+[PROVENANCE.json](PROVENANCE.json) for the machine-checked shipped-artifact and
+original procedural-lineage ledger. Run `npm run provenance`, `npm run licenses`,
+and `npm run sbom` before accepting assets or dependencies.
 
 ## Aircraft
 
diff --git a/package.json b/package.json
index 73fbef1..1c316eb 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc --noEmit && vite build",
+    "provenance": "node scripts/check-provenance.mjs && node scripts/check-no-binaries.mjs",
     "licenses": "node scripts/check-dependency-licenses.mjs",
     "sbom": "npm sbom --package-lock-only --sbom-format=spdx",
     "test": "node --test \"src/test/*.test.ts\"",
diff --git a/scripts/check-dependency-licenses.mjs b/scripts/check-dependency-licenses.mjs
index c102c1c..2a088ff 100644
--- a/scripts/check-dependency-licenses.mjs
+++ b/scripts/check-dependency-licenses.mjs
@@ -48,6 +48,14 @@ for (const [path, entry] of Object.entries(lock.packages ?? {})) {
   if (typeof resolved === "string" && /^(?:git\+|github:|gitlab:|bitbucket:)/i.test(resolved)) {
     problems.push(`${path}: source dependency ${resolved} is not a registry artifact`);
   }
+  if (path.startsWith("node_modules/") && entry.link !== true) {
+    if (typeof resolved !== "string" || !/^https:\/\/registry\.npmjs\.org\//.test(resolved)) {
+      problems.push(`${path}: dependency is not pinned to the npm registry in package-lock.json`);
+    }
+    if (typeof entry.integrity !== "string" || !/^sha(?:256|384|512)-/.test(entry.integrity)) {
+      problems.push(`${path}: dependency has no recognized lockfile integrity hash`);
+    }
+  }
 }
 
 if (problems.length > 0) {
diff --git a/scripts/check-no-binaries.mjs b/scripts/check-no-binaries.mjs
index 19b55c6..4040e20 100644
--- a/scripts/check-no-binaries.mjs
+++ b/scripts/check-no-binaries.mjs
@@ -44,6 +44,9 @@ const DENIED_EXTENSIONS = new Set([
   ".jpg",
   ".jpeg",
   ".webp",
+  ".gif",
+  ".svg",
+  ".ico",
   ".hdr",
   ".exr",
   ".ttf",
@@ -52,6 +55,9 @@ const DENIED_EXTENSIONS = new Set([
   ".woff2",
   ".mp3",
   ".wav",
+  ".ogg",
+  ".mp4",
+  ".webm",
   ".fbx",
   ".obj",
 ]);
diff --git a/scripts/check-provenance.mjs b/scripts/check-provenance.mjs
new file mode 100644
index 0000000..8c266ad
--- /dev/null
+++ b/scripts/check-provenance.mjs
@@ -0,0 +1,159 @@
+#!/usr/bin/env node
+/**
+ * Distribution provenance gate.
+ *
+ * Every tracked media/model/font artifact must be listed exactly once in
+ * PROVENANCE.json and match its recorded SHA-256. Original generated artifacts
+ * must name a tracked generator and lineage note. A copied item additionally
+ * needs an immutable upstream revision, exact upstream path, and intake record.
+ */
+
+import { createHash } from "node:crypto";
+import { execFileSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+import { dirname, extname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), "..");
+const manifestPath = resolve(root, "PROVENANCE.json");
+const ARTIFACT_EXTENSIONS = new Set([
+  ".png", ".jpg", ".jpeg", ".webp", ".gif", ".svg", ".ico",
+  ".glb", ".gltf", ".fbx", ".obj", ".hdr", ".exr",
+  ".ttf", ".otf", ".woff", ".woff2",
+  ".mp3", ".wav", ".ogg", ".mp4", ".webm",
+]);
+const FONT_EXTENSIONS = new Set([".ttf", ".otf", ".woff", ".woff2"]);
+const ALLOWED_ARTIFACT_LICENSES = new Set([
+  "Apache-2.0", "BSD-3-Clause", "CC0-1.0", "CC-BY-4.0", "ISC", "MIT",
+]);
+const problems = [];
+
+function trackedFiles() {
+  try {
+    return execFileSync("git", ["ls-files", "-z"], {
+      cwd: root,
+      encoding: "utf8",
+      maxBuffer: 64 * 1024 * 1024,
+    }).split("\0").filter(Boolean);
+  } catch {
+    console.error("check-provenance: FAIL — run this gate inside a git checkout.");
+    process.exit(1);
+  }
+}
+
+function nonEmpty(value) {
+  return typeof value === "string" && value.trim().length > 0;
+}
+
+function validDate(value) {
+  return typeof value === "string" && /^\d{4}-\d{2}-\d{2}$/.test(value);
+}
+
+function hash(path) {
+  return createHash("sha256").update(readFileSync(resolve(root, path))).digest("hex");
+}
+
+function pathIsCovered(path, tracked) {
+  if (path.endsWith("/")) return [...tracked].some((candidate) => candidate.startsWith(path));
+  return tracked.has(path);
+}
+
+let manifest;
+try {
+  manifest = JSON.parse(readFileSync(manifestPath, "utf8"));
+} catch (error) {
+  console.error(`check-provenance: FAIL — cannot parse PROVENANCE.json (${String(error)}).`);
+  process.exit(1);
+}
+
+const tracked = new Set(trackedFiles());
+const artifacts = [...tracked].filter((path) => ARTIFACT_EXTENSIONS.has(extname(path).toLowerCase()));
+const records = Array.isArray(manifest.distributedArtifacts) ? manifest.distributedArtifacts : [];
+const recordCounts = new Map();
+
+if (manifest.schemaVersion !== 1) problems.push("schemaVersion must be 1");
+if (!nonEmpty(manifest.projectLicense)) problems.push("projectLicense is required");
+
+for (const [index, record] of records.entries()) {
+  const at = `distributedArtifacts[${index}]`;
+  if (!nonEmpty(record?.path)) {
+    problems.push(`${at}: path is required`);
+    continue;
+  }
+  recordCounts.set(record.path, (recordCounts.get(record.path) ?? 0) + 1);
+  if (!tracked.has(record.path)) problems.push(`${at}: ${record.path} is not a tracked file`);
+  if (!ARTIFACT_EXTENSIONS.has(extname(record.path).toLowerCase())) {
+    problems.push(`${at}: ${record.path} is not a recognized distribution artifact`);
+  }
+  if (!nonEmpty(record.kind)) problems.push(`${at}: kind is required`);
+  if (!ALLOWED_ARTIFACT_LICENSES.has(record.license)) {
+    problems.push(`${at}: license ${String(record.license)} is not in the reviewed allowlist`);
+  }
+  if (!/^[a-f0-9]{64}$/.test(record.sha256 ?? "")) problems.push(`${at}: sha256 must be 64 lowercase hex characters`);
+  else if (tracked.has(record.path) && hash(record.path) !== record.sha256) problems.push(`${at}: SHA-256 mismatch for ${record.path}`);
+  if (!validDate(record.intakeDate)) problems.push(`${at}: intakeDate must be YYYY-MM-DD`);
+  if (!nonEmpty(record.intakeNote)) problems.push(`${at}: intakeNote is required`);
+
+  if (record.origin === "repository-generated") {
+    if (!nonEmpty(record.generator) || !tracked.has(record.generator)) {
+      problems.push(`${at}: repository-generated artifact requires a tracked generator`);
+    }
+    if (!Array.isArray(record.inputs) || record.inputs.length === 0 ||
+        record.inputs.some((input) => !nonEmpty(input) || !tracked.has(input))) {
+      problems.push(`${at}: repository-generated artifact requires non-empty tracked inputs`);
+    }
+    if (record.source !== undefined) problems.push(`${at}: repository-generated artifact must not claim an upstream source`);
+  } else if (record.origin === "copied") {
+    const source = record.source;
+    if (!nonEmpty(source?.url) || !/^https:\/\//.test(source.url)) problems.push(`${at}: copied item requires an HTTPS source URL`);
+    if (!nonEmpty(source?.upstreamPath)) problems.push(`${at}: copied item requires its exact upstreamPath`);
+    if (!nonEmpty(source?.revision) || !/^[a-f0-9]{40,64}$/i.test(source.revision)) {
+      problems.push(`${at}: copied item requires an immutable 40-64 hex upstream revision`);
+    } else if (nonEmpty(source?.url) && !source.url.toLowerCase().includes(source.revision.toLowerCase())) {
+      problems.push(`${at}: copied item source URL must be pinned to its recorded revision`);
+    }
+  } else {
+    problems.push(`${at}: origin must be repository-generated or copied`);
+  }
+}
+
+for (const artifact of artifacts) {
+  const count = recordCounts.get(artifact) ?? 0;
+  if (count !== 1) problems.push(`${artifact}: expected exactly one manifest record, found ${count}`);
+}
+for (const [path, count] of recordCounts) {
+  if (count !== 1) problems.push(`${path}: duplicate manifest records (${count})`);
+}
+
+const lineage = Array.isArray(manifest.proceduralLineage) ? manifest.proceduralLineage : [];
+if (lineage.length === 0) problems.push("proceduralLineage must contain at least one original-source record");
+for (const [index, record] of lineage.entries()) {
+  const at = `proceduralLineage[${index}]`;
+  if (!nonEmpty(record?.path) || !pathIsCovered(record.path, tracked)) problems.push(`${at}: path must identify tracked source`);
+  if (record?.origin !== "original") problems.push(`${at}: origin must be original`);
+  if (!nonEmpty(record?.kind)) problems.push(`${at}: kind is required`);
+  if (record?.sourceLicense !== "Apache-2.0") problems.push(`${at}: sourceLicense must be Apache-2.0`);
+  if (!nonEmpty(record?.lineage)) problems.push(`${at}: lineage is required`);
+}
+
+const trackedFonts = artifacts.filter((path) => FONT_EXTENSIONS.has(extname(path).toLowerCase()));
+const codeFiles = [...tracked].filter((path) =>
+  path !== "scripts/check-provenance.mjs" && /\.(?:css|html|js|mjs|ts|tsx)$/.test(path)
+);
+for (const path of codeFiles) {
+  const text = readFileSync(resolve(root, path), "utf8");
+  if (/@font-face\b/i.test(text) || /fonts\.(?:googleapis|gstatic)\.com/i.test(text)) {
+    problems.push(`${path}: bundled/remote web fonts are forbidden by the system-font policy`);
+  }
+}
+
+if (problems.length > 0) {
+  console.error("\ncheck-provenance: FAIL\n");
+  for (const problem of problems) console.error(`  ${problem}`);
+  console.error("");
+  process.exit(1);
+}
+
+console.log(`check-provenance: ok — ${artifacts.length} tracked distribution artifacts are hash-manifested.`);
+console.log(`  ${records.filter((record) => record.origin === "copied").length} copied items; ${lineage.length} original procedural/data lineage records.`);
+console.log(`  ${trackedFonts.length} bundled fonts; system-font/no-remote-font policy verified.`);
diff --git a/server/src/realtime/service.ts b/server/src/realtime/service.ts
index 9fc149a..851fd55 100644
--- a/server/src/realtime/service.ts
+++ b/server/src/realtime/service.ts
@@ -37,6 +37,7 @@ export interface RealtimeServiceOptions {
   rateWindowMs?: number;
   actorMotionLimits?: MotionLimits;
   vehicleMotionLimits?: MotionLimits;
+  aircraftMotionLimits?: MotionLimits;
 }
 
 export interface RealtimeJoinInput {
@@ -103,6 +104,7 @@ interface ResolvedOptions {
   rateWindowMs: number;
   actorMotionLimits: MotionLimits;
   vehicleMotionLimits: MotionLimits;
+  aircraftMotionLimits: MotionLimits;
 }
 
 export interface RealtimeService {
@@ -176,6 +178,13 @@ function resolveOptions(value: RealtimeServiceOptions): ResolvedOptions {
       positionSlackM: 4,
       maximumDeltaSeconds: 2,
     },
+    aircraftMotionLimits: value.aircraftMotionLimits ?? {
+      maximumHorizontalSpeedMps: 125,
+      maximumVerticalSpeedMps: 45,
+      maximumTurnRateDegPerSec: 180,
+      positionSlackM: 6,
+      maximumDeltaSeconds: 2,
+    },
   };
 }
 
@@ -208,7 +217,9 @@ function clonePose(pose: EntityPoseSnapshot): EntityPoseSnapshot {
 }
 
 function entityKey(pose: EntityPoseSnapshot): string {
-  return pose.entity === "actor" ? `actor:${pose.actorId}` : `vehicle:${pose.vehicleId}`;
+  if (pose.entity === "actor") return `actor:${pose.actorId}`;
+  if (pose.entity === "vehicle") return `vehicle:${pose.vehicleId}`;
+  return `aircraft:${pose.aircraftId}`;
 }
 
 function poseInterestKey(pose: EntityPoseSnapshot): string | null {
@@ -569,8 +580,16 @@ export function createRealtimeService(options: RealtimeServiceOptions = {}): Rea
     }
     if (
       (snapshot.entity === "actor" && snapshot.actorId !== session.actorId) ||
-      (snapshot.entity === "vehicle" && snapshot.driverActorId !== session.actorId)
+      (snapshot.entity === "vehicle" && snapshot.driverActorId !== session.actorId) ||
+      (snapshot.entity === "aircraft" && snapshot.pilotActorId !== session.actorId)
     ) return { ok: false, code: "ownership", message: "Realtime entity is not owned by this session." };
+    if (snapshot.entity === "aircraft" && snapshot.pose.space !== "geographic") {
+      return {
+        ok: false,
+        code: "interest",
+        message: "Aircraft poses require an outdoor geographic interest.",
+      };
+    }
     const localKey = poseInterestKey(snapshot);
     if (localKey !== null && !session.interestKeys.has(localKey)) {
       return { ok: false, code: "interest", message: "Realtime pose is outside the joined interest." };
@@ -585,10 +604,15 @@ export function createRealtimeService(options: RealtimeServiceOptions = {}): Rea
     const key = entityKey(snapshot);
     const previous = session.proposedPoses.get(key);
     if (previous) {
+      const motionLimits = snapshot.entity === "vehicle"
+        ? settings.vehicleMotionLimits
+        : snapshot.entity === "aircraft"
+          ? settings.aircraftMotionLimits
+          : settings.actorMotionLimits;
       const motion = validateMotion(
         previous,
         snapshot,
-        snapshot.entity === "vehicle" ? settings.vehicleMotionLimits : settings.actorMotionLimits,
+        motionLimits,
       );
       if (!motion.ok) {
         return { ok: false, code: "motion", message: `Realtime motion rejected: ${motion.reason}.` };
diff --git a/server/src/test/realtime.test.ts b/server/src/test/realtime.test.ts
index fca3da1..195027f 100644
--- a/server/src/test/realtime.test.ts
+++ b/server/src/test/realtime.test.ts
@@ -3,6 +3,7 @@ import { createHmac } from "node:crypto";
 import { after, describe, it } from "node:test";
 import type {
   ActorPoseSnapshot,
+  AircraftPoseSnapshot,
   FloorInterest,
   InterestCell,
   PoseDelta,
@@ -102,6 +103,37 @@ function vehiclePose(
   };
 }
 
+function aircraftPose(
+  pilotActorId: string,
+  sequence: number,
+  timestampMs: number,
+  lat = 37.7,
+): AircraftPoseSnapshot {
+  return {
+    entity: "aircraft",
+    aircraftId: `aircraft-${pilotActorId}`,
+    kind: "electric-vtail",
+    pilotActorId,
+    sequence,
+    timestampMs,
+    pose: {
+      space: "geographic",
+      lat,
+      lng: -122.4,
+      altitudeM: 1_500,
+      headingDeg: 320,
+      pitchDeg: 2,
+    },
+    velocity: { xMps: -40, yMps: 2, zMps: 48, yawDegPerSec: 2 },
+    rollDeg: -12,
+    throttle: 0.7,
+    rollInput: -0.25,
+    pitchInput: 0.1,
+    yawInput: 0,
+    fanRadians: 3,
+  };
+}
+
 function joined(
   service: ReturnType<typeof createRealtimeService>,
   actorId: string,
@@ -211,6 +243,63 @@ describe("authoritative realtime service", () => {
     assert.equal(socalMessages.length, 0);
   });
 
+  it("converges two clients on an owned aircraft and rejects authority, space, and speed attacks", () => {
+    let now = 16_000;
+    const service = createRealtimeService({ now: () => now });
+    const bay = { kind: "city" as const, cityId: "bay-area" as const };
+    const pilot = joined(service, "opaque-pilot", [bay], "private-pilot-subject");
+    const observer = joined(service, "opaque-observer", [bay], "private-observer-subject");
+    const received: PoseDelta[] = [];
+    service.connect(observer.sessionId, observer.token, (message) => {
+      if (message.type === "pose-delta") received.push(message);
+    });
+
+    const first = service.submitPose(
+      pilot.sessionId,
+      pilot.token,
+      aircraftPose("opaque-pilot", 1, now),
+    );
+    assert.equal(first.ok, true);
+    assert.equal(received.length, 1);
+    assert.equal(received[0]?.updates[0]?.entity, "aircraft");
+    assert.equal(JSON.stringify(received[0]).includes("private-pilot-subject"), false);
+
+    const stolen = service.submitPose(
+      observer.sessionId,
+      observer.token,
+      aircraftPose("opaque-pilot", 1, now),
+    );
+    assert.equal(stolen.ok, false);
+    if (!stolen.ok) assert.equal(stolen.code, "ownership");
+
+    const local = aircraftPose("opaque-pilot", 2, now);
+    const invalidSpace = service.submitPose(pilot.sessionId, pilot.token, {
+      ...local,
+      pose: { space: "local", cell: bay, xM: 0, yM: 0, zM: 0, headingDeg: 0, pitchDeg: 0 },
+    });
+    assert.equal(invalidSpace.ok, false);
+    if (!invalidSpace.ok) assert.equal(invalidSpace.code, "interest");
+
+    now += 1_000;
+    assert.equal(service.submitPose(
+      pilot.sessionId,
+      pilot.token,
+      aircraftPose("opaque-pilot", 2, now, 37.7005),
+    ).ok, true);
+    now += 100;
+    const speedHack = service.submitPose(
+      pilot.sessionId,
+      pilot.token,
+      aircraftPose("opaque-pilot", 3, now, 38.7),
+    );
+    assert.equal(speedHack.ok, false);
+    if (!speedHack.ok) assert.equal(speedHack.code, "motion");
+
+    const lateObserver = joined(service, "opaque-late-observer", [bay]);
+    assert.equal(lateObserver.grant.initial.length, 1);
+    assert.equal(lateObserver.grant.initial[0]?.entity, "aircraft");
+  });
+
   it("removes the previous entity when one session switches actor to vehicle", () => {
     let now = 17_000;
     const service = createRealtimeService({ now: () => now });
diff --git a/src/aircraft/index.ts b/src/aircraft/index.ts
index fef3961..bc21238 100644
--- a/src/aircraft/index.ts
+++ b/src/aircraft/index.ts
@@ -40,3 +40,7 @@ export {
   type SceneAircraftOptions,
   type SceneAircraftView,
 } from "./sceneAircraft.ts";
+export {
+  createAircraftPoseSnapshot,
+  type AircraftRealtimeIdentity,
+} from "./realtime.ts";
diff --git a/src/aircraft/realtime.ts b/src/aircraft/realtime.ts
new file mode 100644
index 0000000..adef6e1
--- /dev/null
+++ b/src/aircraft/realtime.ts
@@ -0,0 +1,60 @@
+/** Renderer-independent bridge from deterministic flight state to realtime protocol state. */
+
+import type { AircraftPoseSnapshot } from "../realtime/types.ts";
+import type { AircraftControllerSnapshot } from "./controller.ts";
+
+export interface AircraftRealtimeIdentity {
+  aircraftId: string;
+  pilotActorId: string;
+}
+
+function identity(value: string, name: string): string {
+  if (typeof value !== "string" || value.length === 0 || value.length > 256) {
+    throw new RangeError(`${name} must be a non-empty string of at most 256 characters`);
+  }
+  return value;
+}
+
+/**
+ * Converts one controller snapshot into the exact geographic wire contract.
+ * Geographic velocity axes are east/up/north; heading zero therefore travels
+ * north even though the Three.js presentation model faces local -Z.
+ */
+export function createAircraftPoseSnapshot(
+  identityValue: AircraftRealtimeIdentity,
+  state: AircraftControllerSnapshot,
+  sequence: number,
+  timestampMs: number,
+): AircraftPoseSnapshot {
+  const heading = state.headingDeg * Math.PI / 180;
+  const pitch = state.pitchDeg * Math.PI / 180;
+  const horizontalSpeedMps = state.speedMps * Math.cos(pitch);
+  return {
+    entity: "aircraft",
+    aircraftId: identity(identityValue.aircraftId, "aircraftId"),
+    kind: "electric-vtail",
+    pilotActorId: identity(identityValue.pilotActorId, "pilotActorId"),
+    sequence,
+    timestampMs,
+    pose: {
+      space: "geographic",
+      lat: state.lat,
+      lng: state.lng,
+      altitudeM: state.altitudeM,
+      headingDeg: state.headingDeg,
+      pitchDeg: state.pitchDeg,
+    },
+    velocity: {
+      xMps: Math.sin(heading) * horizontalSpeedMps,
+      yMps: state.verticalSpeedMps,
+      zMps: Math.cos(heading) * horizontalSpeedMps,
+      yawDegPerSec: 0,
+    },
+    rollDeg: state.rollDeg,
+    throttle: state.throttle,
+    rollInput: state.rollInput,
+    pitchInput: state.pitchInput,
+    yawInput: state.yawInput,
+    fanRadians: state.fanRadians,
+  };
+}
diff --git a/src/main.ts b/src/main.ts
index c79c57a..8069ddf 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -83,6 +83,7 @@ import type { ActorIdentity } from "./actors/controller.ts";
 import { SRGBColorSpace, VideoTexture } from "three";
 import {
   CALIFORNIA_AIR_ROUTE,
+  createAircraftPoseSnapshot,
   type AircraftActionSnapshot,
 } from "./aircraft/index.ts";
 import {
@@ -254,6 +255,8 @@ let cityId = "california";
  */
 let wantedCity = "california";
 let office: OfficeScene | null = null;
+/** The pack used by `office`; kept separate from the currently selected door. */
+let builtOfficeId: string | null = null;
 let inside = false;
 let markers: Marker[] = SAMPLE_MARKERS;
 let realtimeClient: RealtimeClient | null = null;
@@ -265,6 +268,7 @@ let realtimePageActive = true;
 /** Page-scoped wire identities; auth subject never enters the spatial protocol. */
 const realtimeActorId = crypto.randomUUID();
 const realtimeVehicleId = crypto.randomUUID();
+const realtimeAircraftId = crypto.randomUUID();
 
 /**
  * The buildings you can walk into, as procedural glyphs on the city.
@@ -773,13 +777,7 @@ async function mountCity(id: string) {
   weatherWatch = null;
   poseEditor?.destroy();
   poseEditor = null;
-  stopWatchingOccupancy();
-  disposeOfficeScreenUi();
-  officePlan?.dispose();
-  officePlan = null;
-  office?.dispose();
-  office = null;
-  officeAtmosphere = null;
+  disposeLoadedOffice();
   inside = false;
   minimap?.dispose();
   minimap = null;
@@ -1185,6 +1183,12 @@ function syncJourneyVehicle(now: number): void {
  */
 async function enterOffice() {
   if (!city) return;
+  // A city can have more than one authored door. Leaving one office parks its
+  // scene for a cheap re-entry, but clicking a different door must not reopen
+  // that cached building under the new office id. Tear down every resource
+  // owned by the old room before loading the requested one; the parked city
+  // actor, journey identity and local profile deliberately live elsewhere.
+  if (office && builtOfficeId !== officeId) disposeLoadedOffice();
   if (!office) {
     const built = await loadOffice();
     // The chunk arrived after the user had already left for the other city, or
@@ -1272,6 +1276,7 @@ async function enterOffice() {
         : { onPlacePick: (place) => showDetail(place ? place.label : null) }),
       ...(createOfficePeers ? { realtimePeers: { create: createOfficePeers } } : {}),
     });
+    builtOfficeId = officeId;
     office.onViewChange(() => renderLegend());
     officePlan = buildOfficePlan(createOfficeMinimap, office);
   }
@@ -1410,6 +1415,18 @@ function leaveOffice() {
   renderLegend();
 }
 
+/** Dispose everything whose coordinates or subscriptions belong to one office. */
+function disposeLoadedOffice(): void {
+  stopWatchingOccupancy();
+  disposeOfficeScreenUi();
+  officePlan?.dispose();
+  officePlan = null;
+  office?.dispose();
+  office = null;
+  builtOfficeId = null;
+  officeAtmosphere = null;
+}
+
 /**
  * Fetch Spaces.
  *
@@ -1634,14 +1651,8 @@ async function switchOffice(id: string) {
   const previous = officeId;
   officeId = id;
 
-  // The roster belongs to the building you have left.
-  stopWatchingOccupancy();
-  disposeOfficeScreenUi();
-  officePlan?.dispose();
-  officePlan = null;
-  office?.dispose();
-  office = null;
-  officeAtmosphere = null;
+  // The roster, screen session, plan and scene all belong to the building left.
+  disposeLoadedOffice();
 
   entering = true;
   try {
@@ -2015,6 +2026,16 @@ function realtimePose(): EntityPoseSnapshot | null {
     };
   }
 
+  const aircraft = city?.aircraftActive() ? city.aircraftState() : null;
+  if (aircraft) {
+    return createAircraftPoseSnapshot(
+      { aircraftId: realtimeAircraftId, pilotActorId: realtimeActorId },
+      aircraft,
+      0,
+      timestampMs,
+    );
+  }
+
   const vehicle = journey.vehicle !== null ? city?.vehicleState() : null;
   if (vehicle) {
     const heading = vehicle.headingDeg * Math.PI / 180;
@@ -2080,7 +2101,11 @@ function realtimePose(): EntityPoseSnapshot | null {
 
 function ownRealtimeEntity(snapshot: EntityPoseSnapshot): boolean {
   if (snapshot.entity === "actor") return snapshot.actorId === realtimeClient?.state().actorId;
-  return snapshot.driverActorId === realtimeClient?.state().actorId || snapshot.vehicleId === realtimeVehicleId;
+  if (snapshot.entity === "vehicle") {
+    return snapshot.driverActorId === realtimeClient?.state().actorId || snapshot.vehicleId === realtimeVehicleId;
+  }
+  return snapshot.pilotActorId === realtimeClient?.state().actorId ||
+    snapshot.aircraftId === realtimeAircraftId;
 }
 
 function clearRealtimePeers(): void {
@@ -2107,7 +2132,11 @@ function applyRealtimeMessage(message: ServerRealtimeMessage): void {
   }
   if (message.type === "pose-delta") {
     for (const id of message.removedEntityIds) {
-      if (id !== `actor:${realtimeClient?.state().actorId}` && id !== `vehicle:${realtimeVehicleId}`) {
+      if (
+        id !== `actor:${realtimeClient?.state().actorId}` &&
+        id !== `vehicle:${realtimeVehicleId}` &&
+        id !== `aircraft:${realtimeAircraftId}`
+      ) {
         target?.removeRemoteEntity(id);
       }
     }
@@ -2804,9 +2833,13 @@ canvas.addEventListener("click", () => {
   const marker = hoveredMarker;
   if (!marker) return;
   const id = officeIdOf(marker);
-  if (id === null) return;
+  if (id === null || entering) return;
+  entering = true;
   officeId = id;
-  void building(`Opening ${marker.label}…`, () => enterOffice());
+  void building(`Opening ${marker.label}…`, () => enterOffice()).finally(() => {
+    entering = false;
+    renderLegend();
+  });
 });
 
 // ---- Panels, plan and overlays ----------------------------------------------
diff --git a/src/realtime/interpolation.ts b/src/realtime/interpolation.ts
index 8b1438d..d036c67 100644
--- a/src/realtime/interpolation.ts
+++ b/src/realtime/interpolation.ts
@@ -96,7 +96,9 @@ function predictPose(pose: SpatialPose, velocity: PoseVelocity, seconds: number)
 }
 
 function id(snapshot: EntityPoseSnapshot): string {
-  return snapshot.entity === "actor" ? `actor:${snapshot.actorId}` : `vehicle:${snapshot.vehicleId}`;
+  if (snapshot.entity === "actor") return `actor:${snapshot.actorId}`;
+  if (snapshot.entity === "vehicle") return `vehicle:${snapshot.vehicleId}`;
+  return `aircraft:${snapshot.aircraftId}`;
 }
 
 export class PoseInterpolationBuffer {
diff --git a/src/realtime/protocol.ts b/src/realtime/protocol.ts
index 72efc82..84102af 100644
--- a/src/realtime/protocol.ts
+++ b/src/realtime/protocol.ts
@@ -114,13 +114,26 @@ export function isEntityPoseSnapshot(value: unknown): value is EntityPoseSnapsho
       (value.kind === "humanoid" || value.kind === "dog" || value.kind === "crow")
     );
   }
+  if (value.entity === "vehicle") {
+    return (
+      string(value.vehicleId) &&
+      value.kind === "model-x" &&
+      (value.driverActorId === null || string(value.driverActorId)) &&
+      finite(value.steering) && value.steering >= -1 && value.steering <= 1 &&
+      finite(value.wheelRadians) && Math.abs(value.wheelRadians) <= 1_000_000
+    );
+  }
   return (
-    value.entity === "vehicle" &&
-    string(value.vehicleId) &&
-    value.kind === "model-x" &&
-    (value.driverActorId === null || string(value.driverActorId)) &&
-    finite(value.steering) && value.steering >= -1 && value.steering <= 1 &&
-    finite(value.wheelRadians) && Math.abs(value.wheelRadians) <= 1_000_000
+    value.entity === "aircraft" &&
+    string(value.aircraftId) &&
+    value.kind === "electric-vtail" &&
+    string(value.pilotActorId) &&
+    finite(value.rollDeg) && value.rollDeg >= -90 && value.rollDeg <= 90 &&
+    finite(value.throttle) && value.throttle >= 0 && value.throttle <= 1 &&
+    finite(value.rollInput) && value.rollInput >= -1 && value.rollInput <= 1 &&
+    finite(value.pitchInput) && value.pitchInput >= -1 && value.pitchInput <= 1 &&
+    finite(value.yawInput) && value.yawInput >= -1 && value.yawInput <= 1 &&
+    finite(value.fanRadians) && Math.abs(value.fanRadians) <= 1_000_000
   );
 }
 
@@ -208,7 +221,9 @@ export function validateServerRealtimeMessage(
 }
 
 function entityId(snapshot: EntityPoseSnapshot): string {
-  return snapshot.entity === "actor" ? `actor:${snapshot.actorId}` : `vehicle:${snapshot.vehicleId}`;
+  if (snapshot.entity === "actor") return `actor:${snapshot.actorId}`;
+  if (snapshot.entity === "vehicle") return `vehicle:${snapshot.vehicleId}`;
+  return `aircraft:${snapshot.aircraftId}`;
 }
 
 function localCellKey(pose: SpatialPose): string | null {
diff --git a/src/realtime/scenePeers.ts b/src/realtime/scenePeers.ts
index 49e9bfd..276e733 100644
--- a/src/realtime/scenePeers.ts
+++ b/src/realtime/scenePeers.ts
@@ -33,6 +33,13 @@ import {
   setModelXWheelRotation,
   type ModelXRig,
 } from "../assets/vehicles/index.ts";
+import {
+  buildElectricAircraft,
+  disposeElectricAircraft,
+  setAircraftControlSurfaces,
+  setAircraftFanRotation,
+  type ElectricAircraftRig,
+} from "../aircraft/asset.ts";
 import { PoseInterpolationBuffer } from "./interpolation.ts";
 import { isEntityPoseSnapshot } from "./protocol.ts";
 import type {
@@ -79,13 +86,15 @@ type PeerVisual =
   | { kind: "humanoid"; rig: HumanoidRig }
   | { kind: "dog"; rig: DogRig }
   | { kind: "crow"; rig: CrowRig }
-  | { kind: "model-x"; rig: ModelXRig };
+  | { kind: "model-x"; rig: ModelXRig }
+  | { kind: "electric-vtail"; rig: ElectricAircraftRig };
 
 interface Prototypes {
   humanoid: HumanoidRig;
   dog: DogRig;
   crow: CrowRig;
   vehicle: ModelXRig;
+  aircraft: ElectricAircraftRig;
 }
 
 interface Peer {
@@ -101,7 +110,9 @@ interface Peer {
 }
 
 export function scenePeerId(snapshot: EntityPoseSnapshot): string {
-  return snapshot.entity === "actor" ? `actor:${snapshot.actorId}` : `vehicle:${snapshot.vehicleId}`;
+  if (snapshot.entity === "actor") return `actor:${snapshot.actorId}`;
+  if (snapshot.entity === "vehicle") return `vehicle:${snapshot.vehicleId}`;
+  return `aircraft:${snapshot.aircraftId}`;
 }
 
 function poseSpaceKey(pose: SpatialPose): string {
@@ -130,10 +141,36 @@ function makePrototypes(): Prototypes {
     dog: buildDog(),
     crow: buildCrow(),
     vehicle,
+    aircraft: buildElectricAircraft(),
+  };
+}
+
+function childGroup(root: THREE.Group, name: string): THREE.Group {
+  const value = root.getObjectByName(name);
+  if (!(value instanceof THREE.Group)) throw new Error(`aircraft prototype is missing ${name}`);
+  return value;
+}
+
+function cloneAircraft(prototype: ElectricAircraftRig): ElectricAircraftRig {
+  const root = prototype.root.clone(true);
+  return {
+    root,
+    leftAileron: childGroup(root, "electric-aircraft.aileron-left"),
+    rightAileron: childGroup(root, "electric-aircraft.aileron-right"),
+    leftVTail: childGroup(root, "electric-aircraft.v-tail-left"),
+    rightVTail: childGroup(root, "electric-aircraft.v-tail-right"),
+    fans: [
+      childGroup(root, "electric-aircraft.fan-left"),
+      childGroup(root, "electric-aircraft.fan-right"),
+    ],
+    ownsMaterials: false,
   };
 }
 
 function cloneVisual(snapshot: EntityPoseSnapshot, prototypes: Prototypes): PeerVisual {
+  if (snapshot.entity === "aircraft") {
+    return { kind: "electric-vtail", rig: cloneAircraft(prototypes.aircraft) };
+  }
   if (snapshot.entity === "vehicle") {
     const rig = cloneModelX(prototypes.vehicle);
     rig.root.name = "generic-black-ev";
@@ -157,7 +194,7 @@ function replaceVisual(peer: Peer, snapshot: EntityPoseSnapshot, prototypes: Pro
 }
 
 function animateActor(
-  visual: Exclude<PeerVisual, { kind: "model-x" }>,
+  visual: Extract<PeerVisual, { kind: "humanoid" | "dog" | "crow" }>,
   sample: BufferedPoseSample,
 ): void {
   const speed = Math.hypot(sample.velocity.xMps, sample.velocity.zMps);
@@ -262,7 +299,9 @@ export function createScenePeers(options: ScenePeersOptions): ScenePeers {
     peer.root.rotation.set(
       THREE.MathUtils.degToRad(pose.pitchDeg),
       -THREE.MathUtils.degToRad(pose.headingDeg),
-      0,
+      peer.latest.entity === "aircraft"
+        ? -THREE.MathUtils.degToRad(peer.latest.rollDeg)
+        : 0,
     );
     if (peer.visual.kind === "model-x") {
       const latest = peer.latest.entity === "vehicle" ? peer.latest : null;
@@ -272,6 +311,16 @@ export function createScenePeers(options: ScenePeersOptions): ScenePeers {
         // wheel geometry rolls forward with negative local-X rotation.
         setModelXWheelRotation(peer.visual.rig, -latest.wheelRadians);
       }
+    } else if (peer.visual.kind === "electric-vtail") {
+      const latest = peer.latest.entity === "aircraft" ? peer.latest : null;
+      if (latest) {
+        setAircraftControlSurfaces(peer.visual.rig, {
+          roll: latest.rollInput,
+          pitch: latest.pitchInput,
+          yaw: latest.yawInput,
+        });
+        setAircraftFanRotation(peer.visual.rig, latest.fanRadians);
+      }
     } else {
       animateActor(peer.visual, sample);
     }
@@ -353,6 +402,7 @@ export function createScenePeers(options: ScenePeersOptions): ScenePeers {
       disposeDog(prototypes.dog);
       disposeCrow(prototypes.crow);
       disposeModelX(prototypes.vehicle);
+      disposeElectricAircraft(prototypes.aircraft);
       disposed = true;
     },
   };
diff --git a/src/realtime/types.ts b/src/realtime/types.ts
index 42a83fb..3652727 100644
--- a/src/realtime/types.ts
+++ b/src/realtime/types.ts
@@ -2,6 +2,7 @@
 
 export type RealtimeActorKind = "humanoid" | "dog" | "crow";
 export type RealtimeVehicleKind = "model-x";
+export type RealtimeAircraftKind = "electric-vtail";
 export type RealtimeMemberRole = "visitor" | "member" | "admin";
 export type RealtimeRevocationReason =
   | "signed-out"
@@ -104,7 +105,21 @@ export interface VehiclePoseSnapshot extends EntityPoseSnapshotBase {
   wheelRadians: number;
 }
 
-export type EntityPoseSnapshot = ActorPoseSnapshot | VehiclePoseSnapshot;
+/** Authoritative state needed to reproduce a piloted aircraft on another client. */
+export interface AircraftPoseSnapshot extends EntityPoseSnapshotBase {
+  entity: "aircraft";
+  aircraftId: string;
+  kind: RealtimeAircraftKind;
+  pilotActorId: string;
+  rollDeg: number;
+  throttle: number;
+  rollInput: number;
+  pitchInput: number;
+  yawInput: number;
+  fanRadians: number;
+}
+
+export type EntityPoseSnapshot = ActorPoseSnapshot | VehiclePoseSnapshot | AircraftPoseSnapshot;
 
 export interface JoinRequest {
   type: "join-request";
diff --git a/src/test/actorOfficeHandoff.test.ts b/src/test/actorOfficeHandoff.test.ts
new file mode 100644
index 0000000..261f8fa
--- /dev/null
+++ b/src/test/actorOfficeHandoff.test.ts
@@ -0,0 +1,173 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import * as THREE from "three";
+import { createSceneActor, type ActorIdentity } from "../actors/index.ts";
+import { createOfficeWalker, type OfficeActorAppearance } from "../interiors/officeWalker.ts";
+import { Plan } from "../interiors/plan.ts";
+import type { Level, Office, Room } from "../interiors/types.ts";
+import { createJourney, journeyReducer, type JourneyActor } from "../journey/index.ts";
+import {
+  actorKindForPresence,
+  createDefaultLocalProfile,
+  resolveHumanoidAppearance,
+} from "../profile/index.ts";
+
+const FLOOR: Room = {
+  id: "floor",
+  name: "Floor",
+  floor: "floor" as never,
+  outline: [{ x: 0, z: 0 }, { x: 10, z: 0 }, { x: 10, z: 8 }, { x: 0, z: 8 }],
+};
+
+function officePlan(): Plan {
+  const level: Level = {
+    id: "ground",
+    name: "Ground",
+    elevation: 0,
+    wallHeight: 3,
+    wallThickness: 0.12,
+    floorplan: {
+      rooms: [FLOOR],
+      walls: [{
+        id: "dividing-wall",
+        from: { x: 5, z: 0 },
+        to: { x: 5, z: 8 },
+        openings: [{ kind: "door", start: 3.4, width: 1.2, sill: 0, head: 2.1 }],
+      }],
+    },
+  };
+  const office: Office = {
+    id: "handoff-office",
+    name: "Handoff Office",
+    levels: [level],
+    viewpoints: [],
+  };
+  return new Plan(office, { warn: false });
+}
+
+function materialColor(root: THREE.Object3D, meshName: string): string {
+  const mesh = root.getObjectByName(meshName);
+  assert.ok(mesh instanceof THREE.Mesh, `${meshName} exists`);
+  assert.ok(mesh.material instanceof THREE.MeshStandardMaterial, `${meshName} has a standard material`);
+  return `#${mesh.material.color.getHexString()}`;
+}
+
+describe("city and office actor acceptance handoff", () => {
+  it("hands an anonymous crow to an office dog, walks through doors, and returns to the same crow", () => {
+    const journeyActor: JourneyActor = {
+      id: "anonymous",
+      kind: "crow",
+      signedIn: false,
+      profile: { displayName: "Guest" },
+    };
+    const identity: ActorIdentity = {
+      id: journeyActor.id,
+      displayName: journeyActor.profile.displayName,
+      authenticated: false,
+      profile: {},
+    };
+    let journey = createJourney({ actor: journeyActor });
+    journey = journeyReducer(journey, { type: "navigate-to-city", city: "bay-area" });
+
+    assert.equal(actorKindForPresence(false, "outdoors"), "crow");
+    const cityActor = createSceneActor({
+      kind: "crow",
+      mode: "flight",
+      identity,
+      position: { x: 12, y: 30, z: -8 },
+      active: true,
+      fixedStepSeconds: 0.1,
+      minFlightAltitude: 5,
+      maxFlightAltitude: 60,
+    });
+    cityActor.setActions({ forward: 1, climb: 0.2 });
+    cityActor.tick(0.5);
+    cityActor.setActive(false);
+    const parkedCityState = cityActor.state();
+
+    journey = journeyReducer(journey, { type: "enter-office", officeId: "lumbridge-hq" });
+    assert.equal(journey.location.scale, "office");
+    assert.deepEqual(journey.actor, journeyActor, "entering never rewrites the serializable identity");
+    assert.equal(actorKindForPresence(false, "office"), "dog");
+
+    const walker = createOfficeWalker(officePlan(), {
+      levelId: "ground",
+      position: { x: 4, z: 4 },
+      actor: { kind: "anonymous-dog" },
+      active: true,
+      speed: 2,
+      fixedStep: 0.1,
+    });
+    walker.setAction({ x: 1, z: 0 });
+    for (let step = 0; step < 10; step += 1) walker.tick(0.1);
+    assert.ok(walker.state().position.x > 5.5, "the possessed dog passes through the authored door gap");
+
+    walker.reset({ levelId: "ground", position: { x: 4, z: 1 } });
+    walker.setAction({ x: 1, z: 0 });
+    for (let step = 0; step < 10; step += 1) walker.tick(0.1);
+    assert.ok(walker.state().position.x < 5, "the same controller cannot cross the solid wall");
+
+    journey = journeyReducer(journey, { type: "leave-office" });
+    assert.equal(journey.location.scale, "bay-area");
+    assert.deepEqual(journey.actor, journeyActor);
+    assert.deepEqual(cityActor.state(), parkedCityState, "the outdoor actor stays parked during the office visit");
+    assert.deepEqual(cityActor.state().identity, identity);
+
+    cityActor.setActive(true);
+    cityActor.setActions({ forward: 1 });
+    cityActor.tick(0.2);
+    assert.ok(cityActor.state().distanceM > parkedCityState.distanceM, "the returned crow is playable");
+    walker.dispose();
+    cityActor.dispose();
+  });
+
+  it("renders one signed-in humanoid appearance on both sides of the office door", () => {
+    const profile = createDefaultLocalProfile("member-acceptance", "Morgan");
+    const appearance = resolveHumanoidAppearance(profile.appearance);
+    const identity: ActorIdentity = {
+      id: "member-acceptance",
+      displayName: profile.displayName,
+      authenticated: true,
+      profile: {
+        appearance: {
+          skinTone: appearance.skinTone,
+          primaryColor: appearance.outfitColor,
+          accentColor: appearance.accentColor,
+          hairColor: appearance.hairColor,
+          bodyShape: appearance.bodyShape,
+        },
+      },
+    };
+    const officeAppearance: OfficeActorAppearance = {
+      kind: "humanoid",
+      skinTone: appearance.skinTone,
+      outfitColor: appearance.outfitColor,
+      accentColor: appearance.accentColor,
+      hairColor: appearance.hairColor,
+      bodyShape: appearance.bodyShape,
+    };
+
+    assert.equal(actorKindForPresence(true, "outdoors"), "humanoid");
+    assert.equal(actorKindForPresence(true, "office"), "humanoid");
+    const cityActor = createSceneActor({ kind: "humanoid", identity });
+    const walker = createOfficeWalker(officePlan(), {
+      levelId: "ground",
+      position: { x: 2, z: 2 },
+      actor: officeAppearance,
+    });
+
+    assert.equal(cityActor.state().identity.id, "member-acceptance");
+    assert.equal(cityActor.state().identity.displayName, "Morgan");
+    assert.ok(cityActor.root.getObjectByName("humanoid"));
+    assert.equal(walker.root.userData.actorType, "humanoid");
+    assert.equal(materialColor(cityActor.root, "humanoid.chest"), appearance.outfitColor);
+    assert.equal(materialColor(walker.root, "humanoid.chest"), appearance.outfitColor);
+    assert.equal(materialColor(cityActor.root, "humanoid.chest.accent"), appearance.accentColor);
+    assert.equal(materialColor(walker.root, "humanoid.chest.accent"), appearance.accentColor);
+    assert.equal(materialColor(cityActor.root, "humanoid.hair"), appearance.hairColor);
+    assert.equal(materialColor(walker.root, "humanoid.hair"), appearance.hairColor);
+
+    walker.dispose();
+    cityActor.dispose();
+  });
+});
diff --git a/src/test/aircraftRealtime.test.ts b/src/test/aircraftRealtime.test.ts
new file mode 100644
index 0000000..fde1c08
--- /dev/null
+++ b/src/test/aircraftRealtime.test.ts
@@ -0,0 +1,78 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  AircraftController,
+  createAircraftPoseSnapshot,
+} from "../aircraft/index.ts";
+import {
+  PoseInterpolationBuffer,
+  isEntityPoseSnapshot,
+} from "../realtime/index.ts";
+
+describe("playable aircraft realtime bridge", () => {
+  it("publishes a strict geographic snapshot with deterministic flight axes", () => {
+    const controller = new AircraftController({
+      initialHeadingDeg: 90,
+      initialSpeedMps: 60,
+      initialAltitudeM: 1_500,
+    });
+    const state = controller.snapshot();
+    const snapshot = createAircraftPoseSnapshot(
+      { aircraftId: "aircraft-page-1", pilotActorId: "actor-page-1" },
+      state,
+      7,
+      10_000,
+    );
+    assert.equal(isEntityPoseSnapshot(snapshot), true);
+    assert.equal(snapshot.entity, "aircraft");
+    assert.equal(snapshot.pose.space, "geographic");
+    assert.ok(Math.abs(snapshot.velocity.xMps - state.speedMps) < 1e-10);
+    assert.ok(Math.abs(snapshot.velocity.zMps) < 1e-10);
+    assert.equal(snapshot.velocity.yMps, state.verticalSpeedMps);
+  });
+
+  it("feeds aircraft samples through the shared deterministic interpolation buffer", () => {
+    const controller = new AircraftController({ initialHeadingDeg: 0, initialSpeedMps: 50 });
+    const first = createAircraftPoseSnapshot(
+      { aircraftId: "aircraft-page-1", pilotActorId: "actor-page-1" },
+      controller.snapshot(),
+      1,
+      1_000,
+    );
+    controller.tick(1, { throttle: 1 });
+    const second = createAircraftPoseSnapshot(
+      { aircraftId: "aircraft-page-1", pilotActorId: "actor-page-1" },
+      controller.snapshot(),
+      2,
+      2_000,
+    );
+    const buffer = new PoseInterpolationBuffer({ interpolationDelayMs: 0 });
+    assert.equal(buffer.push(first), true);
+    assert.equal(buffer.push(second), true);
+    const sample = buffer.sample(1_500);
+    assert.equal(sample?.mode, "interpolated");
+    assert.equal(sample?.pose.space, "geographic");
+    if (sample?.pose.space === "geographic" && first.pose.space === "geographic" && second.pose.space === "geographic") {
+      assert.ok(sample.pose.lat >= Math.min(first.pose.lat, second.pose.lat));
+      assert.ok(sample.pose.lat <= Math.max(first.pose.lat, second.pose.lat));
+    }
+  });
+
+  it("rejects non-wire-safe identity and aircraft controls", () => {
+    const controller = new AircraftController();
+    assert.throws(() => createAircraftPoseSnapshot(
+      { aircraftId: "", pilotActorId: "actor-page-1" },
+      controller.snapshot(),
+      1,
+      1_000,
+    ), RangeError);
+    const valid = createAircraftPoseSnapshot(
+      { aircraftId: "aircraft-page-1", pilotActorId: "actor-page-1" },
+      controller.snapshot(),
+      1,
+      1_000,
+    );
+    assert.equal(isEntityPoseSnapshot({ ...valid, throttle: 1.01 }), false);
+    assert.equal(isEntityPoseSnapshot({ ...valid, rollDeg: Number.NaN }), false);
+  });
+});
diff --git a/src/test/scenePeers.test.ts b/src/test/scenePeers.test.ts
index 1a20abc..4c96fa1 100644
--- a/src/test/scenePeers.test.ts
+++ b/src/test/scenePeers.test.ts
@@ -5,6 +5,7 @@ import {
   createScenePeers,
   scenePeerId,
   type ActorPoseSnapshot,
+  type AircraftPoseSnapshot,
   type EntityPoseSnapshot,
   type InterestCell,
   type ScenePeersOptions,
@@ -48,6 +49,25 @@ function vehicle(sequence: number, timestampMs: number, lat: number): VehiclePos
   };
 }
 
+function aircraft(sequence: number, timestampMs: number, lat: number): AircraftPoseSnapshot {
+  return {
+    entity: "aircraft",
+    aircraftId: "evtol-1",
+    kind: "electric-vtail",
+    pilotActorId: "pilot-1",
+    sequence,
+    timestampMs,
+    pose: { space: "geographic", lat, lng: -121, altitudeM: 1_500, headingDeg: 30, pitchDeg: 5 },
+    velocity: { xMps: 30, yMps: 2, zMps: 52, yawDegPerSec: 4 },
+    rollDeg: 18,
+    throttle: 0.72,
+    rollInput: 0.4,
+    pitchInput: -0.2,
+    yawInput: 0.1,
+    fanRadians: 2.4,
+  };
+}
+
 function fixture(over: Partial<ScenePeersOptions> = {}) {
   return createScenePeers({
     project: (lat, lng) => [lng * 2, -lat * 3],
@@ -120,6 +140,23 @@ describe("remote scene peers", () => {
     peers.dispose();
   });
 
+  it("renders a remote piloted aircraft with authoritative bank and rig state", () => {
+    const peers = fixture();
+    const snapshot = aircraft(1, 1_000, 37.7);
+    assert.equal(scenePeerId(snapshot), "aircraft:evtol-1");
+    assert.equal(peers.upsert(snapshot), true);
+    assert.equal(peers.tick(1_000), 1);
+    const root = peers.root.children[0] as THREE.Group;
+    assert.deepEqual(root.position.toArray(), [-242, 155, -113.10000000000001]);
+    assert.ok(Math.abs(root.rotation.x - 5 * Math.PI / 180) < 1e-12);
+    assert.ok(Math.abs(root.rotation.y + 30 * Math.PI / 180) < 1e-12);
+    assert.ok(Math.abs(root.rotation.z + 18 * Math.PI / 180) < 1e-12);
+    assert.ok(root.getObjectByName("electric-aircraft"));
+    assert.equal(root.getObjectByName("electric-aircraft.fan-left")?.rotation.z, 2.4);
+    assert.ok(Math.abs((root.getObjectByName("electric-aircraft.aileron-left")?.rotation.x ?? 0) - 0.18) < 1e-12);
+    peers.dispose();
+  });
+
   it("shares prototype resources while kind changes retain the entity root", () => {
     const peers = fixture();
     peers.upsert(actor("one", "humanoid", 1, 1_000, 0));