It is obvious that the search for the crash was interfered with by people in positions of authority (government). And, it is obvious that the reason was to protect people who were guilty of something. I don't know if it had anything to do with the assassination of Kennedy, but it could have.
Jack Ruby didn't shoot Oswald just because Oswald was alleged to have shot a President Ruby was fond of. Ruby had other motives. The Warren Commission was a farce. Records were sealed for fifty years, I think it was, reportedly to spare the Kennedy family more pain(yeah, right). Knowing what you have told, I would not be surprised to learn that Jim's crash was somehow linked to the Kennedy murder.
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