In terms of vertical airspace, how high does Class G airspace extend?

Class G airspace, also known as uncontrolled airspace, extends up to 1,200 feet above ground level (AGL) in most situations. This definition is fundamental in the structure of airspace classifications in the National Airspace System (NAS).

Class G airspace is defined as areas where air traffic control (ATC) does not provide services, and pilots must operate under visual flight rules (VFR). The limit of 1,200 feet AGL reflects the height at which more controlled air spaces, such as Class E, begin to take effect in many regions, particularly in the United States. This classification ensures a balance between the need for pilot autonomy in low-altitude operations and the safety concerns associated with higher-altitude traffic that requires more control and regulation.

Thus, the correct definition of Class G airspace includes its vertical extent up to 1,200 feet AGL, highlighting the operational context and safety management principles in uncontrolled areas of the airspace.