An airport building is composed of three main components: a HANGAR (6 letters), a TERMINAL (8 letters), and a control tower (12 letters). A HANGAR is a large, open-sided structure used to store aircraft. A TERMINAL is the main building at an airport, where passengers check in, go through security, and board their flights. The control tower is a tall building from which air traffic controllers direct aircraft on the ground and in the air.