Much less that they were flying the planes, which I don't think is likely.
I can believe that the alleged hijackers were on some of the planes, but:
Why weren't the alleged hijackers on any of the flight lists, boarding lists?
Are there any real security photos or etc. showing they boarded?
Everything I've seen has indications of tampering.
And which of the 2 flight 11 planes at Boston Logan did they board, the one at Gate 26 which seems to have had the passengers, or the one at Gate 32 which the FAA tracked towards New York?
Why do the official boarding times stamped by computer show some passengers loaded after the flight supposedly left? Which is consistent with 2 of the passengers at Gate 26 calling relatives and saying that their flight was delayed, as did flight attendent Amy Sweeney. the "official" flight from Gate 32 was officially on time but there's no evidence it had any passengers.
http://www.flcv.com/offcom11.html