题目内容
Air traffic control provides traffic ______ services to the aircraft on a time permitting basis.
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The aircraft must be placed in a flow _________ the aircraft’s route of flight.
The effort to place the aircraft in a flow is complicated by the following but _______.
When the aircraft approaches its destination, the ACC is responsible for providing many destination airports with _______.
Flow restrictions often begin in the middle of the route, as controllers will ______ aircraft landing in the same destination so that when the aircraft are close to their destination they are sequenced.
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