What type of airspace has no authority from air traffic control and applies to Visual Flight Rules?

Class G airspace is the type of airspace that operates without air traffic control authority and is specifically designed for visual flight rules (VFR). This airspace classification is typically found in areas that are less congested and does not require pilots to establish communication with air traffic control, allowing for more flexibility in flight operations.

In Class G airspace, pilots can operate under VFR conditions, meaning that they navigate primarily by visual reference to the ground and maintain separation from other aircraft visually. This type of airspace covers both surface level up to certain altitudes, often extending up to the base of controlled airspace such as Class E.

The other classes of airspace, like Class A, Class C, and Class E, involve varying levels of control and are regulated by air traffic control to ensure safety and efficient air traffic management. Class A requires all aircraft to operate under Instrument Flight Rules (IFR) and maintain communication with air traffic control. Class C and Class E airspace also require communication with ATC in certain situations, making them incompatible with the definition of airspace that operates without ATC authority for VFR operations.