What type of airspace would be used for pilots flying under visual flight rules?

Pilots flying under visual flight rules (VFR) typically operate in Class G airspace because it is uncontrolled airspace, allowing pilots to navigate and communicate visually rather than relying solely on air traffic control. Class G airspace is generally found at lower altitudes and is not subject to the same regulatory requirements as controlled airspace, making it more accessible for private pilots who prefer to maintain visual contact with the ground and other aircraft.

In contrast, Class A airspace is entirely controlled and is only accessible to pilots operating under instrument flight rules (IFR), as it is located from 18,000 feet up to FL600. Class C and Class E airspaces are also controlled to varying degrees, with Class C requiring communication with air traffic control for operating within it, and Class E often requiring IFR or VFR clearance depending on the specific airspace characteristics. Hence, these other classes present restrictions and requirements not suited for VFR flight.