AT 9:32 A.M., air traffic controllers at Dulles airport saw a green dot on their radar screens that no one expected, traveling eastbound at the surprisingly fast speed of about 500 miles per hour. Among those who noticed the unidentified aircraft was Danielle O’Brien, the air traffic controller who for some reason had wished Flight 77’s pilots “good luck” when she handed them off an hour earlier. From its speed and how it turned and slashed across the sky, she and other controllers initially thought the object on their radar was a nimble military jet. O’Brien slid to her left and pointed it
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