What flight level is controlled airspace?

Definition. Generally, that airspace from the surface to 4,000 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower, are serviced by a radar approach control, and that have a certain number of IFR operations or passenger enplanements.



Controlled airspace is a generic term covering various altitudes depending on the specific classification of the area, but in many regions like the US, Class A airspace exists from Flight Level 180 (18,000 feet) up to and including Flight Level 600 (60,000 feet). Below these levels, controlled airspace is structured into Classes B, C, D, and E, which often surround busy airports. For example, Class B typically extends from the surface to 10,000 feet MSL around the nation's busiest hubs. In 2026, pilots must maintain two-way radio communication with Air Traffic Control and use transponders with altitude reporting (Mode C) to enter these zones. While uncontrolled airspace (Class G) exists at lower altitudes, almost all commercial cruising and terminal operations take place within strictly managed flight levels to ensure safe separation between aircraft.

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Presently the airspace between FL 600 and up to the border between the earth's atmosphere and outer space (generally an altitude of approximately 100 km (62 mi) (the Kármán line)) is not regulated. The FAA does consider the airspace above FL600 to be controlled Class E airspace.

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Class G. Individual countries designate different portions of airspace as class G, e.g. in the UK, airspace above FL660 (Flight Level 660 or 66,000 feet) is uncontrolled and belonging to class G, while in the US, any airspace above FL600 (60,000 feet) is designated as class E and therefore controlled.

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There is no existing mechanism for the FAA to monitor if there are drone pilots, licensed or otherwise, who will fly above this altitude limit. That is well and fine until you get into a close encounter with a manned aircraft, for which you could be facing heavy penalties if the FAA can identify you as the drone pilot.

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Controlled airspace is found around some airports and at certain altitudes where air traffic controllers are actively communicating with, directing, and separating all air traffic. Other airspace is considered uncontrolled in the sense that air traffic controllers are not directing air traffic within its limits.

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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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(a) No person may operate an airplane under VFR in uncontrolled airspace when the ceiling is less than 1,000 feet unless flight visibility is at least 2 miles. (2) At night—1 mile.

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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.

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In the United States, the Federal Aviation Administration (FAA) has the sole authority to regulate all navigable airspace exclusively determining the rules and requirements for its use.

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As the federal authority over operations in all airspace and the regulating authority over operations, the FAA will ensure that the ETM cooperative vision aligns with agency goals and meets the requirements for safe and efficient operations.

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Jets are the primary user of Class A airspace. It ranges from 18,000 feet (Flight Level 180) to 60,000 feet (FL600). Altitudes 18,000 feet and above are called Flight Levels (FL). Class A airspace is not specifically charted on aeronautical charts.

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The maximum height that a commercial airplane is allowed to reach when they fly is 42,000 feet, as this is the universally approved maximum altitude. This max altitude for airplanes is known as the “service ceiling.” Most commercial air jets fly at such a high altitude because it is known to optimize efficiency.

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Uncontrolled airspace or Class G airspace is the portion of the airspace that has not been designated as Class A, B, C, D, or E. It is therefore designated uncontrolled airspace. Class G airspace extends from the surface to the base of the overlying Class E airspace.

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In theory, a pilot can operate in sub-VMC conditions under IFR without an ATC clearance in Class G airspace. However, to enter or operate in controlled airspace under IFR, an ATC clearance is required.

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Class C: This is the controlled airspace above 7,500 feet and surrounding major airports. Both IFR and VFR flights are permitted and both require ATC clearance and separation service is to be provided by ATC. Class G: This airspace is uncontrolled.

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How and when can drone pilots use LAANC ? Drone pilots planning to fly under 400 feet in controlled airspace around airports must receive an airspace authorization from the FAA before they fly. LAANC is available to pilots operating under the Small UAS Rule Part 107 or under the exception for Recreational Flyers.

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Remote ID also helps the FAA, law enforcement, and other federal agencies locate the control station when a drone appears to be flying in an unsafe manner or where it is not allowed to fly.

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