题目内容
The procedural control uses the following information but _______ to ensure separation.
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Air traffic control provides traffic ______ services to the aircraft on a time permitting basis.
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 _______.
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