Mayday at 40,000 Feet! (1977)
The co-pilot and engineer of a passenger jet struggle to keep the plane airborne after a marshal onboard, transporting a murderer to prison, has a heart attack and the killer uses his gun to shoot the captain and blow out the hydraulics.
Directed by: Robert Butler
Starring: David Janssen, Don Meredith, Christopher George, Ray Milland, Lynda Day George, Margaret Blye
Links: IMDb, Movie posters, Movie stills