diff --git a/shared/data/flightlab/types.ts b/shared/data/flightlab/types.ts
new file mode 100644
index 0000000..7947eae
--- /dev/null
+++ b/shared/data/flightlab/types.ts
@@ -0,0 +1,63 @@
+// shared/data/flightlab/types.ts
+
+export interface FlightLabSound {
+  id: string
+  action: 'play' | 'stop' | 'crossfade'
+  volume?: number
+  loop?: boolean
+}
+
+export interface FlightLabButton {
+  id: string
+  label: string
+  icon?: string
+  next: string
+  type?: 'primary' | 'comfort' | 'info'
+  instructorAlert?: string
+}
+
+export interface FlightLabPhase {
+  id: string
+  atcMessage: string
+  explanation?: string
+  buttons: FlightLabButton[]
+  sounds?: FlightLabSound[]
+  instructorNote?: string
+  autoAdvanceAfterTTS?: boolean
+}
+
+export interface FlightLabScenario {
+  id: string
+  title: string
+  description: string
+  icon: string
+  aircraft: string
+  airport: string
+  runway: string
+  callsign: string
+  phases: FlightLabPhase[]
+}
+
+export type FlightLabRole = 'instructor' | 'participant'
+
+export interface FlightLabSessionState {
+  sessionCode: string
+  scenarioId: string
+  currentPhaseId: string
+  isPaused: boolean
+  startedAt: number
+  participantConnected: boolean
+  history: Array<{
+    phaseId: string
+    buttonId: string
+    timestamp: number
+  }>
+}
+
+export type FlightLabWSEvent =
+  | { type: 'state-change'; state: FlightLabSessionState }
+  | { type: 'instructor-message'; text: string; withRadioEffect: boolean }
+  | { type: 'instructor-command'; command: 'pause' | 'resume' | 'restart' | 'skip' | 'back'; targetPhaseId?: string }
+  | { type: 'participant-action'; buttonId: string; phaseId: string }
+  | { type: 'session-joined'; role: FlightLabRole }
+  | { type: 'error'; message: string }