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In this September 16, 2001, file photo, flight attendant Susan Udvari pauses at a memorial near the crash site of United Airlines Flight 93, in Shanksville, Pa. The London residents who used a fire extinguisher and even a 5-foot (1.52 meter) narwhal tusk Friday, Nov. 29, 2019, to fight back against an attacker who stabbed two people to death and wounded three others was a reminder of how ordinary people can take extraordinary actions in efforts to save themselves and others. On Sept. 11, 2001, people aboard the plane tried to wrest control of the cockpit. (Photo by Gary Tramontina/AP Photo/File)
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