What term describes the operational movements of helicopters within the boundary of an airport?

The term that best describes the operational movements of helicopters within the boundary of an airport is "air taxiing operations." This refers to the process wherein helicopters operate at low altitudes while transitioning from one point at the airport to another, typically while maintaining a safe distance from the ground, structures, and other aircraft.

Air taxiing operations are essential for helicopters as they navigate in a vertical flight environment. This term encompasses movements that happen in controlled airspace and can include transitioning to takeoff or landing areas within the airport premises. It highlights the unique operational procedures helicopters follow as they do not conform to traditional taxiing on runways or taxiways like fixed-wing aircraft.

Other options, while related to helicopter operations, do not encompass the broad range of movements specifically adapted to the airport environment. Taxiing flights typically refer to ground movements of aircraft on runways or taxiways. Hovering operations are a specific flight maneuver often used for takeoffs or landings but do not define the overall operational movements within the airport boundary. Finally, landing operations pertain to the final phase of flight leading to touchdown and do not cover all movements of helicopters within the airport area.