Beach Bum, it is the responsibility of the party making the claim to prove that claim. If they contend every person was killed and plane was destroyed, then show us the plane.
I can make a statement that I own the Pacific Ocean. Are you saying that until someone else produces a deed, it's mine?
Really, when a person says "if you can't prove where the bodies went, then we don't have to prove where they went", you're just playing word games with treason. And that would put you on the wrong side.
Besides, I think it was Richard Pearl who reported on the morning of 9/11 that a plane had crashed at the Ohio/Kentucky border. Hello, Flight 93?