[Tobbin]

There is one other possibility here too. The plane could have exploded on impact with the ground and skidded into the pentagon at a deflected angle.This would have absorbed a great amount of speed from the plane. Also, many of the planes have parts made from Molbydenum (sp?) (I think that's what it's called) and when these are heated to a certain point (possible from the flash point of an explosion) will burn to a degree where they will create the 3 points of the fire triangle without any assistance from outside atomosphere. In other words, does not need oxygen to burn and will provide enough heat that it will burn itself out. This is one of the reasons why a crash can leave little debris. When I was in the Navy, we were instructed to push airplane off of the ship (safety videos), rather than try to fight the fire because there is no way to put it out (short of exploding a concussion bomb beside it). Even when aircraft would be pushed into the water, the fire would still burn because it was superhot and provided it's own oxygen. Just something to note.