What is the primary characteristic of Class G airspace?

Class G airspace is defined primarily as uncontrolled airspace, meaning that it is not actively managed by Air Traffic Control (ATC). In this type of airspace, pilots operate with less oversight compared to controlled airspace, and they are responsible for their own separation and navigation. This characteristic allows for a greater degree of freedom for pilots, particularly in lower-altitude operations where fewer aircraft typically operate.

Uncontrolled airspace is fundamentally different from controlled airspace, which is designated for aircraft operations where ATC services are provided for separation and traffic management. Within Class G airspace, pilots are expected to adhere to visual flight rules (VFR) and maintain situational awareness themselves, as the level of ATC intervention is minimal or nonexistent.

The other characteristics associated with Class G airspace, such as its vertical limits, can vary, but the defining feature that sets it apart from other classes is its lack of control by ATC, allowing for a more flexible operational environment for aviators.