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.
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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 ?
European aviation control agency Eurocontrol said on Tuesday about half of scheduled air traffic in Europe was expected to operate -- about 14,000 flights -- up from a third on Monday.
I even got onto planes and then got kicked off.' European aviation control agency Eurocontrol said on Tuesday about half of scheduled air traffic in Europe was expected to operate: about 14,000 flights, up from a third on Monday.
The European aviation control agency Eurocontrol said on Monday it expected between 8,000 and 9,000 flights to operate in Europe.
Summary: Brussels, April 20, 2010, SPA -- About half of scheduled air traffic in Europe is expected to operate on Tuesday because of the spread of volcanic ash from Iceland, an increase on previous days, European aviation control agency Eurocontrol said.
"Accordingly a limited 'no-fly zone' will be established by the states concerned, based on forecasts from the VAAC [Volcanic Ash Advisory Centre]," Eurocontrol, the continent's aviation control body, said in a statement on Monday.
Only about 30 percent of the normal number of flights will operate in Europe on Monday because of the spread of volcanic ash from Iceland, the European aviation control agency Eurocontrol said.
Spain's European Union affairs minister Diego Lopez Garrido told reporters after a meeting at European aviation control agency Eurocontrol: "The forecast is that there will be half of flights possibly operating (on Monday)."
Under the three-year contract, Hill will manage the construction of senior and junior bachelors quarters for over 250 residents, a warehouse complex consist- ing of 15 separate buildings, an aviation control building and ive schools.
Later on the day, the passengers learned that the pilot of Sun-Air Boeing 737 was instructed by the aviation control to delay landing for 10 minutes in order to allow another aircraft to take off on the same runway.
They include, but are not limited to, fire, rescue and police stations, designated earthquake and hurricane shelters (i.e., public schools), power generating stations, structures containing highly toxic material as defined by the IBC, national defense structures, wastewater treatment facilities, aviation control towers and air traffic control centers.
military return aviation control authority of airspace over and around Yokota base to Japan.
The fly-over went ahead despite criticism by the Polish museum located at the site and a claim by a Polish aviation control spokeswoman that poor weather had led to the cancellation of the tribute.

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