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Would like you all to remain seated. There is a bomb on board and are going back to the airport, and to have our demands [unintelligible]. Please remain quiet. The controller responded: “United 93, understand you have a bomb on board. C. At 9:41, Cleveland Center lost United 93’s transponder signal. ” At 9:49, 13 minutes after Cleveland Center had asked about getting military help, the Command Center suggested that someone at headquarters should decide whether to request military assistance: FAA Headquarters: They’re pulling Jeff away to go talk about United 93.

4pp 7/17/04 9:12 AM Page 19 “WE HAVE SOME PLANES” 19 The controller checked to see if American Airlines could establish communication with American 11. He became even more concerned as its route changed, moving into another sector’s airspace. 108 At 8:24:38, the following transmission came from American 11: American 11: We have some planes. Just stay quiet, and you’ll be okay. We are returning to the airport. ” The next transmission came seconds later: American 11: Nobody move. Everything will be okay.

A controller could also briefly lose a commercial aircraft’s transponder signal, although this happened much less frequently. However, the simultaneous loss of radio and transponder signal would be a rare and alarming occurrence, and would normally indicate a catastrophic system failure or an aircraft crash. 95 NORAD Mission and Structure. NORAD is a binational command established in 1958 between the United States and Canada. 96 The threat of Soviet bombers diminished significantly as the Cold War ended, and the number of NORAD alert sites was reduced from its Cold War high of 26.

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911 Report


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