Noun
airstair (plural airstairs)
A set of stairs permitting entry to and exit from an aeroplane, typically built into a folding door.
Back in the air Boeing 727 with the aft airstair open At approximately 7:40 pm the 727 took off with only Cooper, pilot Scott, flight attendant Mucklow, copilot Rataczak, and flight engineer H. E. Anderson aboard. Source: Internet
FBI agents, pushing a convert sled out of the open airstair, were able to reproduce the upward motion of the tail section described by the flight crew at 8:13 pm. Source: Internet
At approximately 8:00 pm a warning light flashed in the cockpit, indicating that the aft airstair apparatus had been activated. Source: Internet