The Wikipedia article about the flight is a fascinating read. I don’t get where it says an Watergate investigating journalist was on board, but ok.
I see why it is fodder for conspiracy theorizing, but as always it’s also not the smoking gun one can make it seem to be, if one presents only a few selected factoids.
https://www.rollingstone.com/feature/the-last-confession-of-e-howard-hunt-76611/