Class G Airspace is all other airspace under 14,500 feet and is uncontrolled airspace. Class G Airspace does not require any authorization to fly in, assuming there are no TFR's or other special restrictions.

In the United States, Class G airspace is the only category that is designated as "uncontrolled" and does not require a specific air traffic control (ATC) clearance or approval for entry under Visual Flight Rules (VFR). Class G airspace typically extends from the surface up to the base of the overlying Class E airspace, which usually begins at either 700 feet or 1,200 feet above ground level (AGL). Within this layer, pilots are responsible for their own see-and-avoid maneuvers, and ATC does not provide separation services. While no radio communication or "permission" is needed to fly in Class G, pilots must still adhere to specific VFR weather minimums regarding visibility and distance from clouds to ensure safety. It is also important to note that while Class E is "controlled" airspace, VFR aircraft generally do not need a specific clearance to enter it either, though they must follow ATC instructions if they choose to use flight following services. However, Class G remains the primary answer for airspace where ATC has no jurisdiction or authority to mandate entry requirements for VFR flights.