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A Temporary Flight Restriction (TFR) is pilot jargon for airspace which has temporarily been closed off for public flight. TFR's are enacted around space shuttle launches, around airshows and other large outdoor events, around the president & vice president when they travel. On September 11th 2001 the entire country was basically put under a TFR until further notice. Aircraft which where already in communication with ATC were vectored to the nearest appropriate airport.

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Q: What is the command given by air traffic control to ground all aircraft As in the USA on September 11th 2001?
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