Air traffic control

Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and in the air. A controller's primary task is to separate certain aircraft — to prevent them from coming too close to each other by use of lateral, vertical and longitudinal separation. Secondary tasks include ensuring safe, orderly and expeditious flow of traffic and providing information to pilots, such as weather, navigation information and NOTAMs (Notices to Airmen).
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The safety separation process to prevent collisions between aircraft and collisions with obstructions while expediting and maintaining an orderly flow of air traffic: an element of the air traffic management process. (FAA7)

Service operated by an appropriate authority to promote the safe, orderly, and expeditious flow of air traffic. (FAA2)

A service operated by appropriate authority to promote the safe, orderly and expeditious flow of air traffic.
(See ICAO term AIR TRAFFIC CONTROL SERVICE.)
 

air traffic control
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CONTROLLO DEL TRAFFICO AEREO. CONTROLLORI DI VOLO. UOMINI RADAR. TORRE DI CONTROLLO