Contact with Flight KQ507 was lost by air traffic control shortly after take-off at 0005 local time (0105 GMT).
Harten said he lost radio contact with Flight 1549 and the plane disappeared from his radar screen as it dropped below New York's skyscrapers.
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But as they approached the runway for takeoff, the FAA reported being back in contact with the Northwest flight.
But as they approached the runway for takeoff, the FAA reported being back in contact with the Northwest flight, and the fighters stayed on the ground.
Since the September, 11, 2001, attacks, NORAD has regularly launched fighter jets to track aircraft in unusual situations, such as when they deviate from flight plans, lose radio contact or enter restricted airspace.
Since the September 11, 2001, terror attacks, NORAD has regularly launched fighter jets to track aircraft in unusual situations such as when they deviate from flight plans, lose radio contact or enter restricted airspace.
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The airports told passengers to contact their airline for up-to-date flight information.
Tom Armstrong, 22, from Kelsale near Saxmundham, was due to arrive at Heathrow Airport on 9 January, but he did not board his flight and he has not been in contact since.
Planes operated under visual flight rules -- rules that require only limited contact with air traffic controllers -- were grounded along with commercial aircraft in the hours immediately following the hijackings.
He must also impose at least two of six possible penalties, which include flight restrictions on Syrian planes and the limitation of diplomatic contact between the two countries.
He was last in contact with his family via email on 6 January, when he told them of his flight plans home.
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