Gypsy Taub comes across as a nut. Makes credibility tough even though she may be sincere and right.
On the other hand this is more credible...
http://www.geocities.com/mknemesis/colonels.html
Right after the whole deal, when planes weren't allowed to fly, i talked to my neighbor, a retired pilot. He is into old cars and we talked that but then talk turned to planes and the whole 9-11 deal. He has flown more hours than almost any person alive, starting before WW2. In everything up to 747's. He still follows aviation keenly in his old age. He thought several things were fishy.
What happened to the anti terrorist flight control program that can land the plane if hijacked?
Making a sharp U turn while descending at high speed like what happened over DC, the heaviness of the controls would mean a very experienced pilot... or remote control.
An intruder in the cockpit can be disarmed in an instant with a quick prod of the joystick. He thought no pilot would give up a plane without trying something and was baffled that four were claimed to have been taken.