I think it was Airport (not Airport 707). It was a Rank film.

I love how spoofing it meant 95% of the dialog and story was the same. What a classic.

Actually they changed the plot to make it less silly.

In the original, the WW2 pilot is on the ground and is lowered into the 707 from a helicopter through the front window. This is briefly referenced in Flying High when they lower the window like in the original.