Which of the following is NOT a component of an airfield?

The passenger terminal is not considered a direct component of the airfield itself. An airfield generally includes areas directly associated with aircraft operations, such as runways, taxiways, and cargo areas. Runways are the surfaces on which aircraft take off and land, while taxiways allow for the movement of aircraft on the ground. Cargo areas are designated spaces for the loading, unloading, and storing of freight, which is also directly linked to airfield operations. In contrast, passenger terminals are facilities designed for the processing of travelers and their baggage, which are typically situated adjacent to the airfield but serve more as support structures than as components of the airfield infrastructure.