United Airlines Flight 93 was hijacked by four al-Qaeda terrorists on the morning of September 11, 2001, as part of the coordinated terrorist attacks on the United States. The hijackers took control of the plane approximately 46 minutes into the flight, after overpowering the pilots. They intended to crash the plane into a federal government building in Washington, D.C., possibly the U.S. Capitol. However, passengers on the flight learned about the earlier attacks on the World Trade Center and the Pentagon through phone calls. They courageously decided to fight back against the hijackers and tried to breach the cockpit door to regain control of the aircraft. This struggle forced the hijackers to crash the plane prematurely in a field near Shanksville, Pennsylvania, at about 10:03 AM, killing everyone on board but preventing the plane from reaching its intended target. The impact created a large crater, and the passengers' heroic intervention is credited with saving many lives on the ground in Washington, D.C. The event of Flight 93 stands as a notable act of defiance and sacrifice during the 9/11 attacks.