What airspace is blue?

Class D airports are depicted on aeronautical charts by a blue dashed circle around the airport symbol. Within the dashed circle is a number enclosed in a dashed square. This number indicates the top of the Class D airspace, expressed in hundreds of feet (MSL).



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Class B airspace is shown with a solid blue line around major airports in circles radiating outward. In the example above, the white arrows are pointing to each circle of the class B airspace.

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Class G airspace is most easily found on a sectional map when a fading, thick blue line appears.

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Class C airspace is designed to establish and maintain safe separation of mixed general aviation and airline traffic. It is usually upside-down wedding cake shaped and depicted on charts with two bold magenta rings along with numbers indicating the airspace floor and ceiling within each ring.

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Class C airspace areas should initially be designed as two concentric circles centered on the airport reference point. The surface area should have a 5 NM radius, and the outer limits of the airspace area should not extend beyond a 10 NM radius.

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The two categories of airspace are: regulatory and nonregulatory. Within these two categories, there are four types: controlled, uncontrolled, special use, and other airspace.

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Class B airspace surrounds the busiest airports from the surface to 10,000 feet MSL. The dimensions of Class B airspace vary depending on the needs of the airport. Class C airspace extends from the surface to 4,000 feet MSL.

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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 F. Class F is not used in the United States. In Canada, Class F is the equivalent of U.S. special use airspace including restricted and alert areas, while ICAO defines it as a hybrid of Class E and Class G, in which ATC separation guidance is available but not required for IFR operation.

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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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The upper limit of the airspace should not exceed 10,000 feet MSL. However, high airport field elevation, adjacent high terrain, or operational factors may warrant a ceiling above 10,000 feet MSL.

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Once you hear your callsign, you can enter the Class C airspace. Keep these important facts in mind: If the controller responds with (Aircraft callsign) standby, you have established two-way radio communication, and you can enter Class C airspace. If you don't hear your callsign, you CAN NOT enter the airspace.

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