On September 11, 2001, United Airlines Flight 93 was one of four planes hijacked as part of a coordinated terrorist attack. This particular flight was en route from Newark International Airport in New Jersey to San Francisco International Airport in California. Passengers and crew attempted to regain control of the aircraft from the hijackers, leading to its crash in a field near Shanksville, Pennsylvania, preventing the attackers from reaching their intended target, believed to be either the White House or the U.S. Capitol.