OMG i've just notice something!!!
Video is here: http://www.youtube.com/watch?v=L75Gga92WO8&NR
Look at frames and so when "plane" hit pentagon... do you see that pieces of building flying around and in front of camera? How far is, and how big they are, and they are flying! Now, ask your self can plane do that or missile (explosion with blast)? As you can see when second plane hit tower there is no such pieces.