2001年9月11日,美国纽约世贸中心大厦和华盛顿国防部所在的五角大楼,连续受到恐怖主义的袭击,造成重大伤亡和损失。在被劫持的波音客机有明显破坏倾向时,美国空军曾奉命出动F-16等型战斗机进行拦截,但是由于战备松懈、时间紧促、情况不明等因素,拦截无功而返,终于未能避免被撞厄运。 On September 11, 2001, the Pentagon, where the United States World Trade Center complex in New York and the Washington Department of Defense were located, was continuously subjected to terrorist attacks, causing heavy casualties and losses. When the hijacked Boeing passenger aircraft had a clear tendency to sabotage, the U.S. Air Force was ordered to intercept the F-16 fighter. However, it was unable to stop the flight because of loosening of combat readiness, tight schedule and unidentified circumstances Was hit bad luck.