Actually, I haven't seen this movie, but when I was very young, I ordered a popular movie (or maybe a popular TV, I can't remember clearly) at home. I read this story in a magazine and was deeply impressed, but I was too young to remember more details. So I searched the corresponding keywords and found this one of yours. Yes, this is the story I saw.

According to the best answer, I found the plane! "(1980), after watching it, it's obvious that this is just a spoof movie, which is similar to The Condor Heroes spoofing The First Blood, not the one we are looking for. So I followed this movie on IMDB and found the main spoof object "Zero Time! "(1954, even the name is very similar).

Zero hour! Finally, I found a resource in the holy city home. I came down to have a look. Although it is raw meat with English subtitles, I can basically understand it. First of all, the temperament of the film is nothing like the writing I remember. The whole movie is full of bitter feelings, and the man in the impression is still flirting with the stewardess, showing the slickness of American youth. Secondly, except for the main line, other details are inconsistent with what you said. The airline didn't say that the man calling was Stryker, and the doctor had thick hair on his forehead. . . .

We can only keep looking along IMDB, and what we can find is Terrir in the sky (1971). However, this movie is a TV movie, not a cinema movie. However, this person's name is Spencer, which is basically the same as what you provided. Looking at the pictures, I feel the same as the words I have seen.

Unfortunately, I haven't found any resources for this film, so the clues I can provide can only stop here.