Imperial Airways, April 6th, 1925. Actually, in 1921 Aeromarine Airways showed a short Howdy Chicago. Aeromarine Airways had amphibian planes and HOWDY CHICAGO was played as they came into Chicago via the lake. Ah, marketing. But Imperial Airways showed a full length box office smash, Conan Doyle's The Lost World from that very year, 1925.
It was until 1961 that airlines began showing feature films as a part of regularly scheduled flights. The first to be shown on a regularly scheduled flight was By Love Possessed with Lana Turner and Efrem Zimbalist Jr. on a TWA flight from New York to Los Angeles. I'll take The Lost World.
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