Being speaker is Fording. A Earlier Ford Presidency Collaborative Open Timeline

Make the cause

  • Weather issues

    Votes: 10 45.5%
  • Engine Failure

    Votes: 6 27.3%
  • Soviet missile

    Votes: 7 31.8%
  • PLO Bomb

    Votes: 4 18.2%

  • Total voters
    22
I'm not sure if this of any help but Wikipedia list of 707 incidents ( if 707 was actually air force one at the time) a couple of unexplained nose dives, and electrical storm, breaking up in turbulenice and turbulence detaching the vertical stabilizer resulting in an uncontrollable dive.

Weather / unknown mechanical failure looking the most plausible
 
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