Actually, this is interesting.

"Mr. Cheney's statement [on Meet the Press] that 'the toughest decision was this question of whether or not we would intercept incoming commercial aircraft' is a lie. Publicly available FAA documents prove that fighter jets routinely intercept commercial aircraft under certain designated circumstances without requiring or asking for approval from the White House."

[ http://emperors-clothes.com/indict/indict-1.htm ]

I wasn't aware that it was routine operating procedure for fighters to intercept commercial aircraft that are off-course and unresponsive to communications. With over an hour's notice of terrorist attacks in progress, it's even more suspicious that nothing happened.

Alex