U.S. Sailors assemble on the fantail aboard the guided missile destroyer USS Ross (DDG 71) in the Black Sea during a 9/11 remembrance ceremony 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.