I live near D.C. and I can confirm (seeing as how my neighbors office was deestroyed in the attack) that it was definitely a plane. I saw the sight soon after, and no there weren't signs of a plane, but these guys probably didn't even know how to slow a plane down. A plane at full speed that hits a stationary object will violently explode leaving nothing. I even know a guy that personally was on break that saw the plane that hit the Pentagon.
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