Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems worldwide is:

to separate aircraft to prevent collisions
to organize and expedite the flow of traffic
to provide information and other support for pilots when able.

In some countries, ATC may also play a security or defense role (as in the United States), or be run entirely by the military (as in Brazil).

Preventing collisions is referred to as separation, which is a term used to prevent aircraft from coming too close to each other by use of lateral, vertical and longitudinal separation minima; many aircraft now have collision avoidance systems installed to act as a backup to ATC observation and instructions. In addition to its primary function, the ATC can provide additional services such as providing information to pilots, weather and navigation information and NOTAMs (NOtices To AirMen).

In many countries, ATC services are provided throughout the majority of airspace, and its services are available to all users (private, military, and commercial). When controllers are responsible for separating some or all aircraft, such airspace is called "controlled airspace" in contrast to "uncontrolled airspace" where aircraft may fly without the use of the air traffic control system. Depending on the type of flight and the class of airspace, ATC may issue instructions that pilots are required to follow, or merely flight information (in some countries known as advisories) to assist pilots operating in the airspace. In all cases, however, the pilot in command has final responsibility for the safety of the flight, and may deviate from ATC instructions in an emergency.

Although the native language for a region is normally used, English must be used on request, as required by the International Civil Aviation Organization (ICAO).

From Wikipedia under the GNU Free Documentation License
Sun Dec 27 06:14:59 2009

How can I become a Air Traffic Control Specialist?
Q. I already have a career but looking to switch careers and was wondering how can I become a Air Traffic Control Specialist? What are the ways I can go about applying and getting accepted to training program in Oklahoma City.
Asked by houston15 - Wed Mar 19 15:24:30 2008 - - 3 Answers - 0 Comments

A. I am the academy now. Looking at the current situation and demand. You have a good chance to get into the field. You can apply two ways right off the street or go to a cti approved school. You take the at-sat test on a given date by faa. If you get 70 or above. You will get an application asking you to state 5 states in which you like to work. One's they have vacancy FAA will call you for an interview. Upon successful completion of interview you will be assigned a facility. Then you will get a class schedule for Oklahoma City. One's you complete training at Oklahoma you go back to your facility and get certified and off you are on your sucess.
Answered by xxillestjattxx - Wed Mar 26 13:53:17 2008

Careers in air traffic control in India?
Q. After completing engineering in electronics&comm., where can I study air traffic control in India, and outside? What are the job prospects, salary scales, etc? Any Indian ATC's here, I'd like to get in touch with.. thanks :)
Asked by arjun_saj - Tue Oct 23 15:42:58 2007 - - 1 Answers - 0 Comments

A. my option will be bangalore and the pay schme will be around 1000 -15000
Answered by Grace M - Wed Oct 24 08:45:22 2007

Should I Go Navy or Air Force for Intelligence or Air Traffic Control?
Q. I am considering a career in the military, either in intelligence or Air Traffic Control. Which branch is superior for enlistment and why?
Asked by Tasha Marie - Sat May 23 21:24:06 2009 - - 3 Answers - 0 Comments

A. I would say Navy for both jobs. The Air Traffic Control rating is pretty good on advancement up to E-4, but it has been slowing down at the E-5 & E-6 levels from overmanning. The AC reserves just converted to active duty, so the rate might close up soon. As far as Intel, advancement is open through E-6, so as long as you studied, you would probably make rank pretty fast. I believe that both jobs require a pretty good ASVAB too (just a heads up). You can't go wring either way.
Answered by unknown - Sat May 23 23:18:22 2009

From Yahoo Answer Search: "Air traffic control"
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Bearish Bets For Cisco And Juniper - Forbes
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If your drawing skills aren't too hot, the lines for Air Traffic Control are provided as a JPEG for you to work with on the cover CD. Aren't we nice? ...

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air traffic control tracon jpg
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77 Lanscaping near the Air Traffic Control Tower at Orlando International Airport Greg Caesar jpg
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77 Lanscaping near the Air Traffic Control Tower at Orlando International Airport Greg Caesar jpg

From Yahoo Image Search: "Air traffic control"
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ROFASix: US Air Traffic Control Breaks (again!)
rofasix.blogspot.com
ROFASix: US Air Traffic Control Breaks (again!)

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Fri, 20 Nov 2009 02:48:01 GM

What I didn't know was that the Canadians have not only provided an example of how NOT to do health care "reform" but have provided an excellent example of what happens when you privatize . air traffic control. functions. ...

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ilcapnews.blogs.com
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He also fielded a variety of questions regarding Tower operations as well as how cadets can prepare for a career in . air traffic control. . Mr. Taylor shared some of his experiences from 23 years as a US . Air. Force . air traffic controller. ...

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In early October, Oman's entire . Air Traffic Control. system, covering the whole damn country, went down for several hours, due to human error and sloppy procedures when operating the underlying IT system. The back-up system failed too. ...

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