Could be nothing, but this is curious:
This sounds like an unofficial incident of the JFK assassination. Can't remember relevant names and retelling best I can, but maybe someone will know what I'm referencing. A fellow (I think a member of the military) hitched a ride in a military transport plane that stopped and picked up two passengers, one that looked like Oswald (guy didn't know that at the time), but had to be a doppelganger. I believe the two were dropped off at another point - out in the desert (may have been Roswell)? The guy told his wife about the incident once they realized JFK had been assassinated. He tried to inform authorities, wasn't believed and either was or just threatened with repercussions if didn't shut up. Best I can do on this fractured memory - too long ago to even think where to look as to where I learned of it. It was a real incident.