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Class D airspace generally cylindrical in form and normally extends from the surface to 2,500 feet (760 m) above the ground. The outer radius of the airspace is variable, but is generally 4 nautical miles. Airspace within the given radius, but in surrounding class C or class B airspace, is excluded.
Though not requiring regulatory action, an outer area is the procedural companion to Class C airspace Normally this area is 20 NM from the primary Class C airspace airport. The normal radius of an outer area is 20 NM from the primary Class C airspace airport.