Pentagon: Impossible flight

The Impossibility of Flying Heavy Aircraft Without Training, by Joel Harel at Physics911.net, provides facts and arguments which appear to discredit the allegation that American Airlines Flight 77 - a Boeing 757 - crashed into the Pentagon on September 11, 2001.

Among the points he makes is that "for the aircraft to impact the ground floor of the Pentagon, Hanjour would have needed to have flown in with the engines buried in the Pentagon lawn." Available photos do not indicate such damage to the Pentagon lawn.