Which airspace type primarily involves operations under Visual Flight Rules (VFR)?

Class G airspace is primarily associated with operations under Visual Flight Rules (VFR). This airspace is uncontrolled and does not have specific regulatory requirements for air traffic control clearance, allowing pilots to navigate using visual references. In Class G airspace, pilots must maintain visual contact with the ground and other aircraft, making it ideal for VFR operations where pilots rely on sight rather than instruments.

In contrast, Classes A, B, and C airspaces are controlled and typically require pilots to operate under Instrument Flight Rules (IFR) or follow specific requirements established by air traffic control to ensure safety among the higher density of traffic. These classifications are designed for situations where more comprehensive ATC communications and traffic separation procedures are essential, which is contrary to the nature of operations allowed in Class G airspace.