AS FIGHTERS PATROLLED the skies over the United States, it remained unknown whether the ground stop ordered by the FAA’s Ben Sliney had interrupted plans for more attacks. One plane that raised questions was United Flight 23, seventh in line for takeoff from John F. Kennedy International Airport, bound for Los Angeles, when flights were halted. Aviation and law enforcement officials told reporters that when the captain announced over the intercom that they were returning to the gate, four young men sitting in first class who appeared to be Middle Eastern became agitated, stood, and consulted
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