United Airlines flight 93 was a domestic passenger flight that was hijacked on September 11, 2001, as part of a coordinated terrorist attack on the United States by al-Qaeda. The plane crashed into a field near Shanksville, Pennsylvania.| Encyclopedia Britannica
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September 11 attacks, series of airline hijackings and suicide attacks committed in 2001 by 19 militants associated with Islamic extremist group al-Qaeda against targets in the United States, the deadliest terrorist attacks on U.S. soil in U.S. history. Over 3,000 people died in the attacks and rescue efforts.| Encyclopedia Britannica