What is the difference between Class C and Class D airports?

Class C airspace is used around airports with a moderate traffic level. Class D is used for smaller airports that have a control tower. The U.S. uses a modified version of the ICAO class C and D airspace, where only radio contact with ATC rather than an ATC clearance is required for VFR operations.



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Class Delta (also referred to as Class D) Airspace areas established around airports that have an Air Traffic Control Tower but do not provide radar services. Containing an Air Traffic Control Tower, Class D airspace areas provide services to pilots.

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Class C airspace areas are designed to improve aviation safety by reducing the risk of mid-air collisions in the terminal area and enhance the management of air traffic operations therein. Aircraft operating in these airspace areas are subject to certain operating rules and equipment requirements.

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The FAA requires that all aircraft obtain ATC approval prior to entering Class D airspace. Approval is given by the ATC facility that provides ATC services for the designated airspace. This is usually the local tower at a controlled airport.

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Most Class C airports are home to flight schools and small aircraft hangars as well as scheduled service by airlines. While still busy, Class C airports have less traffic than Class B, so ATC doesn't need as much space to keep them organized. Like Class B, approach control services are provided.

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Class D airports have an Air Traffic Control Tower to coordinate airport operations. However, unlike Class B and C airports, they don't require a mandatory approach and departure control (though many do have approach/departure).

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Class C service requires pilots to establish two-way radio communications before entering Class C airspace. If the controller responds to a radio call with, “(a/c call sign) standby,” radio communications have been established and the pilot can enter Class C airspace.

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Class C Airspace (Mandatory Radar) A shelf area with an outer radius of 10 nautical miles surrounds the core area. It extends from 1200 feet AGL to 4000 feet AGL. The airspace is depicted on charts as 2 concentric magenta circles. For example, an airport with a surface altitude of 500 feet MSL is depicted above.

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Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C airspace area at an indicated airspeed of more than 200 knots (230 mph).

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Class D airspace includes the smallest airports in the United States with an operational control tower. Although it is required to request and receive permission from the FAA, it is typically easier to do than most airspaces due to the small number of manned aircraft in the area.

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Note that the Class D airspace becomes Class E Airspace when the tower is closed; presumably surface airspace, although the AFD does not make this clear.

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Light Blue = Class D controlled airspace Class 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.

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Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500' AGL within 4 NM of the primary airport of a Class D airspace area at an indicated airspeed of more than 200 knots (230 mph)

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The medium Airliner Jets, like the Boeing 737 and the Airbus 320, normally fall into Category C. Aircraft Approach Category D is for Large Arline Jets and Military Aircrafts.

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The purpose of Class C airspace is to enhance aviation safety in the terminal area and to decrease the risk of midair collisions by providing traffic separation service.

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