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Class D Airspace. Class D airspace is generally from the surface to 4,000 ft. above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower. The configuration of each Class D airspace area is individually tailored and when instrument procedures are published, the airspace is normally designed to contain the procedures.
Class Charlie Airspace. Introduction: Class Charlie (also referred to as Class C) Airspace areas are designed to improve aviation safety by reducing the risk of midair collisions in the terminal area and enhance the management of air traffic operations therein.