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Originally posted by MOPP4
My 2 cents:
I think what we're seeing is the result of the impact of the jet. You see the smoke first a second before you hear the impact - this seems normal given the distance the filmer is from the buiding. You would not hear the sound at the same instant as the impact. Same principle as see lightning and then hearing the thunder moments later.
But what shocks me in this video is how loud the sirens passing close by to the camera in the beggining are, but at 6:20 when the second plane supposedly hits, you can just barely hear a slight roar maybe starting at 6:18, then the crash, and its very, very faint. You would think you'd hear a much louder screaming for a longer period of time from a 767 flying into the building. Unless he was on the opposite side, it appears it definitely didnt fly right over him, but still I would expect to hear more of an approach roar from a large passenger jet.