The Disappearance of Flight 412 is a 1974 science fiction movie starring Glenn Ford and David Soul. I remember David Soul best from his time in Here Come the Brides and from his Star Trek connection.
This film offers proof that the voice-over narration LIVES!
You can watch this made-for-tv film via Internet Archive:
Million Monkey Theater does its usual fine job of giving a thorough overview of the plot and calls it "dated".