air traffic control

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air traffic control,

the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that route airplanes along established airways to airport traffic control centers. There Instrument Landing Systems and Microwave Landing Systems enable planes to land safely in almost any weather conditions. Air traffic controllers, who are responsible for maintaining safe distances between planes, are employees of the U.S. Dept. of Transportation. Air traffic control is made possible by special transponders installed in every commercial and many private aircraft, which automatically transmit information on a plane's altitude and speed to the ground controller. The distortion that often affects voice transmissions can be eliminated by the use of cockpit datalinks; collision avoidance systems provide further safety margins. Knowing the course, speed, and altitude of every plane in the sector, the controller can contact each in turn to give landing or course instructions. Modern air traffic control has contributed to making air travel far safer than highway travel, and on a passenger-mile basis safer even than rail travel.

air traffic control (ATC)

A service provided by the appropriate authority to promote the safe, orderly, and expeditious flow of traffic.
References in periodicals archive ?
The introduction of ARC builds upon Northrop Grumman Park Air System's established expertise in managing aircraft traffic in complex airport environments.
volume in light aircraft traffic that impacts on hundreds of small airstrips
Through its joint venture with Turkish ground handler Celebi, NAS also provides ground handling services at the Mumbai International Airport which has the highest amount of passenger and aircraft traffic in the country and look towards introducing its operational synergies to these airports to increase efficiencies and improve service levels.
During the same period, aircraft traffic at Sharjah International Airport increased 18.
Schweitz, a contract videographer, was filming a U-2 student training sortie conducting touch-and-go landings in the base's aircraft traffic pattern.
BAA's basic business of handling aircraft traffic is governed by regulator-set tariffs at its three London airports and, because it is a secure business with recurring revenues, could command a higher debt rating than the company as a whole.
Runways 24R and 24L on the existing north airfield now handle nearly half of all aircraft traffic at LAX.
The new authorisations delivered by the French authorities now enable Sagem to fly its drones over a determined, but large, area around the airfield at restricted periods of time during which normal aircraft traffic is halted.
In Phase 1, the consultants will: prepare a master plan of PIA, and undertake feasibility studies to determine the least-cost option for the expansion of the existing facilities of PIA to meet projected aircraft traffic and passenger throughput over the next 15 years.
Through time, Bryan eventually emigrated to New Zealand where he worked as an aircraft traffic controller.
The top of the island is outfitted with various radar and communications antennas, which monitor ship and aircraft traffic, intercept and jam enemy radar signals, track enemy aircraft and missiles, and pick up satellite signals, among other things.
The National Trust had claimed that an increase in aircraft traffic could damage the nearby 15th century Speke Hall.

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