hijackers in the September 11 attacks were 19 men affiliated with al-Qaeda . 15 of the 19 were citizens of Saudi Arabia , two were from the United Arab Emirates , one was from Lebanon , and one was from Egypt . The hijackers were organized into four teams , each led by a pilot-trained hijacker with three or four " muscle hijackers , " who were trained to help subdue the pilots , passengers , and crew
September 11 attacks
September 11 attacks
Hijackers in the September 11 attacks