There is currently a shortage of ~3k controllers (as of this comment), and the time to train and put new controllers into service is significant. Excess retirements reduces time to system failure due to labor shortages.
> Entry-level applicants must complete required training courses and spend several months at the FAA Academy in Oklahoma City. Applicants are paid while in training. After graduating the academy, individuals are placed in locations across the country and must gain 2-3 years additional training, both classroom and on-the-job experience, before becoming a certified professional controller. This rigorous training includes close supervision and evaluation by senior controllers that ensures controllers are competent, professional, know their airspace environment and can deal with the pressures and high pace of the job.
Controllers in training have been quitting because of the shutdown.
> The shutdown is having real consequences, as some students at the controller academy have already decided to abandon the profession because they don’t want to work in a job they won’t be paid for, Duffy said. That will only make it harder for the FAA to hire enough controllers to eliminate the shortage, since training takes years. He said that the government is only a week or two away from running out of money to pay students at the academy.
> “Currently nearly 50 percent of major air traffic control facilities are experiencing staffing shortages, and nearly 90 percent of air traffic controllers are out at New York–area facilities,” the FAA said in a statement posted on X on Friday evening.
https://www.faa.gov/air-traffic-controller-qualifications
> Entry-level applicants must complete required training courses and spend several months at the FAA Academy in Oklahoma City. Applicants are paid while in training. After graduating the academy, individuals are placed in locations across the country and must gain 2-3 years additional training, both classroom and on-the-job experience, before becoming a certified professional controller. This rigorous training includes close supervision and evaluation by senior controllers that ensures controllers are competent, professional, know their airspace environment and can deal with the pressures and high pace of the job.
Controllers in training have been quitting because of the shutdown.
Flights to Los Angeles Airport halted due to air traffic controller shortage - https://news.ycombinator.com/item?id=45715771 - October 2025
> The shutdown is having real consequences, as some students at the controller academy have already decided to abandon the profession because they don’t want to work in a job they won’t be paid for, Duffy said. That will only make it harder for the FAA to hire enough controllers to eliminate the shortage, since training takes years. He said that the government is only a week or two away from running out of money to pay students at the academy.
Air traffic controller shortages cause widespread flight delays amid government shutdown - https://www.nbcnews.com/news/us-news/air-traffic-controller-... - November 1st, 2025
> “Currently nearly 50 percent of major air traffic control facilities are experiencing staffing shortages, and nearly 90 percent of air traffic controllers are out at New York–area facilities,” the FAA said in a statement posted on X on Friday evening.
(think in systems)