U.S. Navy petty officers first class line up in formation before the start of a 9/11 Heroes Run sponsored by the chief's mess with the Aircraft Intermediate Maintenance Detachment at Naval Air Facility Atsugi, Japan, Sept. 11, 2014. Terrorists hijacked four passenger aircraft Sept. 11, 2001. Two of the aircraft were deliberately crashed into the World Trade Center in New York; one was crashed into the Pentagon; the fourth crashed near Shanksville, Pa. Nearly 3,000 people died in the attacks.