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.

Under FAA regulations in 2026, uncontrolled airspace is designated as Class G airspace. This is the portion of the sky where Air Traffic Control (ATC) does not exercise executive authority or provide separation services for aircraft. Class G typically extends from the surface up to the base of the overlying controlled airspace (usually Class E, starting at 700 or 1,200 feet above ground level). In uncontrolled airspace, the "See and Avoid" principle is the primary method for preventing collisions. Pilots are not required to communicate with ATC or have a flight plan if flying under Visual Flight Rules (VFR), though they must still adhere to specific cloud clearance and visibility minimums. While it offers the most freedom for general aviation, it requires a high degree of pilot vigilance. Most remote rural areas and small, non-towered airports reside within Class G. It is essential for pilots to check their sectional charts, as uncontrolled airspace is becoming rarer near urban centers where Class B, C, and D controlled zones are expanding to accommodate increased commercial and drone traffic.