A 9/11 commemoration is held at Fort McHenry in Baltimore Sept. 11, 2014, during the Star-Spangled Spectacular. U.S. Service members visited Baltimore in honor of the 200-year anniversary of "The Star-Spangled Banner." 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.