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Air traffic control (1)
AIR TRAFFIC CONTROL (1)

Definition: The activity of giving instructions by radio to pilots of aircraft so that they know when and where to take off or land.
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See perfect activity (1).

See perfect directive (1).

See perfect instruction (2).
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See perfect take-off (1).

See perfect landing (2).

See perfect timing (1).
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See perfect ground control.

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