Air Traffic Control

http://en.wikipedia.org/wiki/Air_traffic_control
https://collegegrad.com/careers/air-traffic-controllers
http://www.bls.gov/ooh/transportation-and-material-moving/air-traffic-controllers.htm
http://www.ifatca.org/
http://www.academicinvest.com/science-careers/physics-careers/how-to-become-an-air-traffic-controller
http://www.airtrafficmanagement.net/
https://www2.kent.edu/caest/undergraduate/aeronautics/air-traffic-control.cfm
http://www.economist.com/news/technology-quarterly/21615069-more-aircraft-take-sky-new-technology-will-allow-pilots-pick-their-own

Related
http://www.findingdulcinea.com/news/on-this-day/July-August-08/On-this-Day--U-S--Air-Traffic-Controllers-Go-on-Strike.html