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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.

air traffic control (ATC)

A service provided by the appropriate authority to promote the safe, orderly, and expeditious flow of traffic.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
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In this situation, that group is the wealthiest one percent who use more air traffic control services than they pay for, all at the expense of the average passengers who subsidize their operations.
The increasing efforts to upgrade airports and incorporate smart city infrastructure also bode well for the global air traffic control equipment market.
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(SeeNews) - Dec 10, 2014 -A Air Navigation Services of the Czech Republic has awarded a dealA for air traffic control software development toA Ifield Computer Consultancy Limited.
German air traffic control said: "Planes disappeared from screens for a matter of seconds, here and there.
NEC has provided air traffic control solutions for more than 50 years, including systems for sophisticated transportation hubs in Japan, South Korea, Taiwan and the Philippines.
The aim of the program is to provide qualified applicants to till developmental air traffic control specialist positions.
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