Saw a documentary, "Grounded on 9-11" on the History Channel a few days ago that mentioned something major about 9-11 that I have not heard before. At 9:00AM on 9-11 United Airlines sent to all planes a warning message regarding the other hijacks. On United Flight 23, that was on the runway, the captain decided on his own not to take off. He fakes a mechanical problem and returns to the gate! When the passengers were asked to exit the plan three Middle Eastern men, or possibly as many as six, refuse to follow the request to deplane. Security is...