Deliberate mistake: The angle of the footage of the Air Force jet (from inside the 747's passengers' viewpoint) observing the 747's damage shows the Air Force jet would be flying away from the 747 instead of flying exactly parallel as the outside footage shows.

Airport 1975 (1974)
1 deliberate mistake - chronological order
Directed by: Jack Smight
Starring: Charlton Heston, George Kennedy, Karen Black, Efrem Zimbalist Jr.

Continuity mistake: The small plane's pilot identifies the aircraft as 232Z. But in the exterior shots, the aircraft's identification is N9750Y. (00:35:00)
Captain Stacy: I hear we expect a bumpy ride tonight.
Urias: I used to know a stewardess who thought that was sexy.
Captain Stacy: You're weird, you know that?
Question: Why is this movie called "Airport"? It is not really a sequel to the original Airport, as Patroni is the only character in both films. Further, the original Airport focused on airport operations. It gave us glimpses of various airport professionals and how they respond to challenges and controversies. That was its appeal. But beyond showing the mobile lounge at Dulles, and it doesn't even introduce us to the pilot, Airport 75 has nothing to do with any airport.
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Answer: It's all about branding and marketing. The first Airport film was hugely successful, prompting a sequel. Reusing "Airport" in the title has built-in name recognition that people would immediately associate with the previous film, which helps sell tickets. The movie is part of what became a movie series (four in all) under the collective "Airport" name.
raywest ★