Airport clearance area refers to what requirements should be met by the scope involved in aircraft take-off and landing.

Landing route airport clearance protection zone refers to a certain space range defined according to the requirements of airport clearance obstacle limit map in order to ensure the safe take-off and landing of aircraft at the airport, which means that the range involved in aircraft take-off and landing should meet the requirements of landing routes. Because the flight altitude of the aircraft in the airport area is relatively low, it is necessary to put forward requirements for the airspace near the airport within a certain range along the take-off and landing routes, that is, clearance requirements, to ensure that there are no obstacles on the ground that hinder navigation and flight when the aircraft takes off and lands at low altitude. This area is called clearance area.