Flight 11's transponder had stopped working. It was no longer sending a radar pulse. The plane's altitude also became a matter of guesswork for controllers, though the Boeing 767 was still visible on radar. Two F-15 jets were reportedly dispatched from Otis Air Force Base. Just before or after the military planes got off the ground, however, the controllers report they lost site of Flight 11's radar signal over Manhattan. The controller who had handled the plane from the beginning of the ordeal was stunned. A few minutes later, the Nashua controllers heard reports that a plane had crashed into a building.
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