What is a characteristic of Class G airspace?

Class G airspace is defined as uncontrolled airspace, which makes it unique compared to other classes of airspace that are typically controlled and require specific communication with Air Traffic Control (ATC). In Class G, pilots operate without the need for an ATC clearance or coordination, allowing for more flexibility in flying. This airspace is vital, especially for general aviation and recreational flyers, as it often exists in areas outside of controlled airspace, enhancing accessibility for pilots.

The other options presented do not accurately characterize Class G airspace. For instance, it does not exclusively cater to military operations; rather, it is available for both civilian and military use. Furthermore, there are no restrictions requiring all flights within Class G airspace to be conducted under Instrument Flight Rules (IFR); both Visual Flight Rules (VFR) and IFR operations are permissible, though IFR flights must still adhere to proper regulations and procedures. Finally, flight is not prohibited at night in Class G airspace; pilots can operate during night hours as long as they meet the necessary qualifications for night flying.