Was Jennings Lang A Thunderbirds Fan?
I saw this film on AMC recently, and was struck by the plot's resemblence to "Operation Crashdive" in Thunderbirds, as well as the "Trapped In The Sky" influence in Airport 1975.
I think the reviewers who slammed these films as unintentionally funny saw Airplane! too many times - Airport '77 is actually a pretty good film; the cast pull it off; I especially liked the interplay of Jack Lemmon (with an annoying mustache) and US Navy divers working to get the plane off the shallow sea floor.