Well i know there is a lot of evidence against this theory, but the explosions in the other floors and in the basement before the plane hit is a big one. A real big one is how there was not one peice of metal found at the crash spot in Penn., just a big hole. That's literally impossible. Also, why would the CIA be grabbing all the evidence in the lawn of the pentagon and then we never know what happened to it? Or why they immediately took the tapes from various hotels and stores across from the pentagon?