"The US needs more than 3,000 new air traffic controllers to reach adequate staffing, according to the National Air Traffic Controllers Association, a union representing 10,800 professional controllers.
“Keep in mind, this particular air traffic control facility has been chronically understaffed for years and without these controllers...Newark airport cannot handle the number of planes that are scheduled“.
https://www.cnn.com/2025/05/04/us/newark-airport-nj-united-flights-delays