teenus, mille eesmärk on 1) kokkupõrgete vältimine õhusõidukite vahel ning õhusõidukite ja takistuste vahel ning 2) lennuliikluse kiirendamine ja selle korrapärase kulgemise tagamine, a service provided for the purpose of: a) preventing collisions: 1) between aircraft, and 2) on the manoeuvring area between aircraft and obstructions, and b) expediting and maintaining an orderly flow of air traffic, an integrated system consisting of air traffic control facilities and equipment, communication services, landing and navigation aids, air traffic control standards, rules and regulations, whose objective is to prevent aircraft collision and expedite and maintain an orderly flow of traffic, a service operated by appropriate authority to promote the safe, orderly and expeditious flow of air traffic