题目内容
_________ is a service provided by ground-based controllers who direct aircraft on the ground and in the air
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En-route air traffic controllers work in facilities called ______.
En-route air traffic controllers issue clearances and instructions for airborne aircraft, and pilots are required to ______ these instructions.
Each ACC is responsible for many thousands of square miles of airspace known as ________ and for airports within that space.
ACC may pick up VFR aircrafts that are _______ and integrate them into the IFR system.
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