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1.
A person who directs pilots from the ground in order to ensure the safe, orderly and expeditious flow of air traffic through his/her airspace.

The air traffic controllers at high volume airports and enroute centers have one of the most stressful jobs in the world and are often unfairly blamed for airport delays. A given airport can only handle a certain number of flights per hour, and the airlines frequently schedule more flights than that number, causing delays that even the most skilled controller could not avoid. Furthermore, each controller is allowed three losses of separation minimums between two aircraft every two and a half years. One more and he/she gets suspended - and many of them are controlling around a hundred planes per hour. Think about that before you blame them for your late flights.
You land a million planes safely, then you have one little mid-air and you never hear the end of it.
by castnoshadow June 08, 2005
 
2.
One who keeps the little blips from running into each other.
The Air Traffic Controller is the one who "really" flies the planes in his or her airspace...NOT THE PILOTS.
by TRACKER July 03, 2007
 
3.
similar to a wingman, an air traffic controller will help a fellow lad get a girl, `the big difference between a wingman and an air traffic controller, the air traffic controller will not engage with the girl, also the air traffic controller will help the lad with any problems that may arise in the lads pulling process.
"Here comes Lucy's ex." "oh, he will be a total cockblock to greg, he has been trying to get Lucy all night." "Don't worry, I will be his Air traffic controller and distract him."
by RG69 January 10, 2013
 
4.
A male who dates more than 4 women outside his 50-mile radius at one time. When it’s time to for the women visit his home city he then becomes an air traffic controller.
Air Traffic Controller: A male who dates more than 4 women outside his 50-mile radius at one time. When it’s time to for the women visit his home city he then becomes an air traffic controller.

Jim has poon in almost every city on the east coast. You should see him at the Holidays he’s like an Air Traffic Controller. “Becky your clear to take off on runway 6” roger, “Linda clear to land runaway 2” out.
by Bent Spear September 11, 2006
 
5.
A person that controlls Airplanes
"Northwest 323 decend and maintain five thousand turn right heading 120"
by Ed McCoy May 08, 2005