    Sentence 1: Phe Comm anil “Center.  edecuted ‘the request: -and;. a, miriute  later; Cleveland Genter: reported ‘that,  United 93 may havea bomb: on board.    Sentence: 2: The Command Ceriter:  executed. the request for? the: fighter  pilots to. search: for a lest. plaite anda  minute. “later. the: Cleveland :Center.  reported “that ‘United 93 may ‘havea  bornb on, board: