Is airspace above FL600 uncontrolled?

All airspace above FL 600 is Class E airspace. 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.



In the United States, the airspace above Flight Level 600 (approximately 60,000 feet) is generally classified as Class E airspace. While Class E is considered "controlled" airspace in a technical sense—meaning that Air Traffic Control (ATC) has the authority to manage it—it is often effectively uncontrolled for many types of flight because it lacks the strict entry and communication requirements found in Class A, B, C, or D airspace. Most commercial and general aviation traffic operates well below this level, typically in Class A airspace which ends exactly at FL600. Above this threshold, the air becomes so thin that only specialized military aircraft, high-altitude research balloons, and supersonic jets can maintain flight. While the FAA maintains jurisdiction, there is no requirement for aircraft to be on an IFR (Instrument Flight Rules) flight plan or in constant contact with ATC, provided they are not interfering with established flight paths or restricted military zones. In 2026, this "upper class" of airspace is increasingly relevant for the testing of hypersonic vehicles and suborbital space tourism.

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This means the FAA has both authority and responsibility for airspace above FL600.

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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.

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Class F airspace is technically designated as uncontrolled, but you can sometimes get ATC clearances as found in controlled airspace. ATC clearances in Class F are advisory only, meaning that you don't legally have to follow ATC directives, and the final responsibility rests with the pilot in command.

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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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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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Military Reconnaissance Aircraft: The Lockheed SR-71 Blackbird had a service ceiling of FL850 and routinely operated above FL600. Many other aircraft in this category (e.g. MiG-25, Tsybin RSR, U-2, RB-57F, M-17 and M-55) can also fly above FL600.

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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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There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).

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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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In class E airspace, IFR aircraft are controlled by ATC. This might be a center facility (Air Route Traffic Control Center) or approach/departure facility. As a VFR aircraft, you aren't required to be in contact with ATC, but IFR aircraft must operate on an ATC clearance. That means the airspace is controlled.

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Restricted areas denote the existence of unusual, often invisible, hazards to aircraft such as artillery firing, aerial gunnery, or guided missiles.

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Class F airspace. Airspace of defined dimensions within which activities must be confined because of their nature, or within which limitations are imposed upon aircraft operations that are not a part of those activities, or both. Special use airspace may be classified as Class F advisory or Class F restricted.

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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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