Noun
air traffic control (uncountable)
A system designed to give assistance to aircraft, to prevent collisions and to manage aircraft flow.
Air traffic control responsibilities at airports are usually divided into at least two main areas: ground and tower, though a single controller may work both stations. Source: Internet
Air traffic control radar is distributed instrumentation system. Source: Internet
Air traffic control automation research The Aviation Systems Division conducts research and development in two primary areas: air traffic management, and high-fidelity flight simulation. Source: Internet
Before the pilot made the mayday distress call, Air Traffic Control was informed by the pilot of the Pakistan International Airlines flight that he was facing problems with the plane's engines. Source: Internet