    Sentence 1: As United 93 left Newark,  the flight's crew members were  ynaware of the hijacking of American    Sentence 2: As the flight uifeg 93  left Newark the crew members were  tragically unaware of the hijacking of  American 1] and if they had been fhey  could have prevented. their own  hijacking by  keepin@® the plane  grounded ygnd double-clicking for  Safety.