Clearance

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clearance

In aviation terminology, authorization for an aircraft to proceed under conditions specified by an air traffic control unit.

For convenience, the term "air traffic control clearance" is frequently abbreviated to "clearance" when used in appropriate contexts. The abbreviated term "clearance" may be prefixed by the words "taxi," "takeoff," "departure," "en route," "approach," or "landing" to indicate the particular portion of flight to which the air traffic clearance relates.

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