This is all just conjecture, and faulty logical comparisons...
And example would be the "a plane could never disappear" inside the Pentagon hole (which is clearly bigger than what the narrator states in the "documentary"). Of course, jets frequently disintegrate and "disappear" on impact... (See photos from Value Jet FL 592 for instance)
What he leaves out is that the Greek flight steward with pilot training was trying to put the plane down, but ran out of fuel, so the plane didn't hit dead on.
Or the fact that the pilot that flew into the Pentagon orbited DC numerous times trying to find the White House. I seriously doubt he executed a sharp turn as stated...