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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.
AIRSPACE. Airspace is classified according to a lettering system. Even though we are not allowed into Classes A, B, C, D, Restricted or Prohibited Areas, we are allowed into nearly all of Class E and all of Class G airspace. (as per FAR 103). After you are done with this tutorial, a great online source of current sectionals for anywhere in the country is located at this site.