What Does Clearance Mean in Aviation?

Clearance is permission given to any aircraft, either commercial or private, that is entering controlled airspace. Clearance is generally issued by air traffic control (ATC) or other air traffic services. When a pilot requests clearance, he or she must submit information about the aircraft, including its call sign, a brief statement, and a flight plan. Entering airspace without clearance can be dangerous to the aircraft, its pilot, and any passengers on board, but in emergencies, it is possible for pilots to ignore air traffic control directives if its required for the safety of the aircraft.

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