Title: Create a timeline of ATC development.
Course: Air Traffic Controller (20999) > Section: Exploring Air Traffic Control (ATC) Systems of the Past, Present, and Future

Timeline should include sequential progression of ATC development from the 1920s to present day and should include significant trends.

Process/Skill Questions:

- What happened in 1981 that affected the field of ATC in the United States?
- What might prevent timely upgrades to the nation’s air traffic control system?