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: United Airlines Flight 93 departs from Newark for San Francisco after a 42-minute delay [5, 20]. 8:46 am : Flight 11 crashes into the North Tower (1 WTC) between floors 93 and 99 [5, 6, 20].
United Airlines Flight 175, flying at 590 mph, strikes the South Tower between floors 77 and 85. Unlike the first impact, this crash is broadcast live on virtually every network. Millions of viewers see the plane disappear into the building. The explosion shears through stairwell A (the only one still intact after the first hit) and kills everyone on impact in the upper floors. The realization dawns that this is not an accident—it is a coordinated terrorist attack. 9 11 timeline
After confirming the second hijacking (United 93) and the threat of American 77, NORAD scrambles three F-16 fighters from Langley Air Force Base in Virginia. They are ordered to intercept any unauthorized aircraft heading toward Washington, D.C. Confusion over flight paths and delayed communication means the jets will not be airborne until after the Pentagon is hit. : United Airlines Flight 93 departs from Newark