NEW YORK (AP) — The scene: Tehran’s Mehrabad airport, January 1980. Six U.S. diplomats, disguised as a fake sci-fi film crew, are about to fly to freedom with their CIA escorts. But suddenly there’s a moment of panic in what had been a smooth trip through the airport.

The plane has mechanical difficulties and will be delayed. Will the Americans be discovered, arrested, even killed? CIA officer Tony Mendez, also in disguise, tries to calm them. Luckily, the flight leaves about an hour later.

If you saw the film “Argo,” no, you didn’t miss this development, which is recounted in Mendez’s book about the real-life operation. It wasn’t there because director Ben Affleck and screenwriter Chris Terrio replaced it with an even more dramatic scenario, involving canceled flight reservations, suspicious Iranian officials who call the Hollywood office of the fake film crew (a call answered just in time), and finally a heart-pounding chase on the tarmac just as the plane’s wheels lift off, seconds from catastrophe.