Add preliminary missing airline check

resources/js/Types/types.d.ts

@@ -303,7 +303,7 @@ export interface Flight {
     airline: Airline | null
     aircraft: Aircraft | null
     seat_type: SeatType | null
-    crew_type: CrewType | null
+    crew_type?: CrewType | null
     flight_reason: FlightReason | null
     flight_class: FlightClass | null
     duration_display: string