What does the term "airside" refer to in airport terminology?

The term "airside" refers specifically to the area of an airport that is accessible by aircraft. This includes the runways, taxiways, and other areas where aircraft operate, as well as the zones where passengers board or disembark from planes after they have passed through security. Understanding the concept of "airside" is crucial for airport management, as it involves the operational aspect of flight services, aircraft handling, and associated safety protocols.

In contrast to airside, the other options describe different parts of the airport. The commercial areas pertain to the terminal spaces designated for shops and restaurants, while parking areas for ground vehicles relate to land-side operations where vehicles transport passengers to and from the airport. Finally, security screening areas are designated for the process of ensuring passenger safety before they access the airside. Each of these areas plays a vital role in airport operations, but none are encompassed by the definition of "airside" as it pertains to aircraft and their operational zones.