Bill, there are eyewitness accounts from people who were there when the thing hit the Pentagon who say that there was no debris at all. None whatever. So it's quite possible that the 757 debris your link refers to was planted after the fact. There is no way to prove otherwise. Actually, there might be a way to prove it, if the government was willing to release the video tapes made by the many security cameras that ring the Pentagon and the video tapes made by businesses across the road from the Pentagon (that were confiscated by the FBI). But the government doesn't want to do that. Concealing evidence is in itself evidence.