What does Class D airspace go up to?

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.



In 2026, standard Class D (Delta) airspace generally extends from the surface up to 2,500 feet above the airport elevation (AGL). While the ceiling is usually set at 2,500 feet AGL, the actual altitude you see on a sectional chart is expressed in Mean Sea Level (MSL) and rounded to the nearest hundred feet. For example, if an airport sits at 1,000 feet MSL, the Class D ceiling would be depicted as "[35]" in a blue dashed box, meaning it goes up to 3,500 feet MSL. The lateral dimensions usually form a cylinder with a radius of approximately 4 to 5 nautical miles around the primary airport. Class D airspace is designed for airports that have an operational control tower but do not have the high volume of traffic seen in Class B or C. In 2026, pilots and drone operators must establish two-way radio communication (or receive LAANC authorization for drones) before entering this space. If the control tower closes for the night, the airspace often reverts to Class E or Class G until the tower reopens in the morning.

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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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Since Class D is controlled airspace all the way to the surface, you can't fly VFR when the ceiling (a broken or overcast cloud layer) is less than 1000' AGL (FAR 91.155 (c)), or when the visibility is less than 3 SM.

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Generally, Class D airspace extends from the surface to 2,500 feet above the airport field elevation. The vertical boundaries are marked with a bold blue number, surrounded by a bold blue dashed square. The number represents the ceiling of Class D airspace in hundreds of feel MSL.

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Controlled and uncontrolled airspaces are the ones you will spend most of your time flying within as a pilot. Controlled airspace consists of five tiers beginning with most restrictive to least restrictive: Class Alpha (A), Class Bravo (B), Class Charlie (C), Class Delta (D), and Class Echo (E).

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Class D. IFR and VFR flights are permitted and all flights are provided with air traffic control service, IFR flights are separated from other IFR flights and receive traffic information in respect of VFR flights, VFR flights receive traffic information in respect of all other flights.

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As a rule of thumb, during the hours the tower is not in operation, the Class D surface area becomes Class E surface area or a combination of Class E to 700' above ground level and Class G to the surface, but this varies with each airport so you'll need to consult the chart supplement.

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As an FAA-certified remote pilot under the Part 107 regulations, if you need to operate in Class B, C, D, or E airspace, you need to get prior approval to operate in that airspace.

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Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska.

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In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.

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Class G airspace (uncontrolled) is that portion of airspace that has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. Rules governing VFR flight have been adopted to assist the pilot in meeting the responsibility to see and avoid other aircraft.

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