A veteran air-traffic controller at the facility that handles flights in and out of Newark Liberty International Airport is calling for more resources and speaking out about the intense pressures workers face amid a staffing shortage and tech outages.

As of May 7, all but two of the 313 air traffic control facilities in the United States were understaffed, a New York Times analysis found.

Moving air traffic controllers means retraining them on the quirks of a new facility, and the process can take years.