U.S. Navy Chief Naval Aircrewman (Helicopter) Matthew Meadows looks at a display representing fallen Service members before a 9/11 commemoration ceremony in Pearl Harbor, Hawaii, 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.