At some airports that have part-time control towers, the Class D surface airspace becomes a Class E Surface Area during the hours the tower is closed. At other airports, the Class D airspace becomes Class G (uncontrolled) airspace.
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Class D is used for all control zones and most terminal areas.Class E is generally used for all airspace from 3500 feet to FL195, with the exception of TMA's and airspace over the North Sea. Class F is not used. Class G is used below 3500 feet, except around controlled airports, and below FL195 over the North Sea.
Airline Class of Service CodesA - First Class Discounted. B - Economy/Coach – Usually an upgradable fare to Business. C - Business Class. D - Business Class Discounted.
Transitional areas, Class E, are designated to serve terminal and en route aircraft to include helicopter operations such as: Transitioning to/from terminal and en route. Transiting between airways and routes. En route climbs or descents.
Restrictions in Class D airspaceMinimum visibility requirements of 3 statute miles. Cloud clearance minimums are 500 feet below, 1,000 feet above, and 2,000 feet horizontally. No VFR flights if ceiling is less than 1,000 feet AGL.
Class D airspace: No transponder is required unless otherwise specified by ATC (Pilots only require two-way radio communication in this class of airspace).
Class D areas should normally extend upward from the surface up to and including 2,500 feet AGL. The altitude must be converted to MSL and rounded to the nearest 100 feet.
Most airspace in the United States is class E. The airspace above FL600 is also class E. No ATC clearance or radio communication is required for VFR flight in class E airspace. VFR visibility and cloud clearance requirements are the same as for class C and D airspaces when below 10,000 feet (3,000 m) MSL.
The main requirements for operating within Class D airspace are to have a functional two-way radio and to establish two-way communication with ATC prior to entering the airspace. Pilots must also meet all of the established weather minimums and obey speed regulations.
Light Blue = Class D controlled airspaceClass D airspace is generally airspace from the surface to 2,500 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower.