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

Travel woes at Newark Airport continued Monday after a weekend featuring another radar outage, a ground stop and dozens of flight cancellations and delays. The FAA announced Newark was operating on a ground delay program,

On Sunday, Sen. Charles Schumer, a Democrat who represents New York, issued a statement demanding U.S. Transportation Secretary Sean Duffy prioritize Newark in the federal government’s new plan to overhaul and modernize the Federal Aviation Administration’s Air Traffic Control system.

The delays continued at Newark Liberty International Airport on Monday evening with average backups of more than 1 1/2 hours.

With summer travel season approaching, the crisis at the New Jersey airport could mean weeks, if not months, of misery for travelers.

The recent chronic delays and cancellations at New Jersey’s largest airport have highlighted the shortage of air traffic controllers and the aging equipment they use, which President Donald Trump's ad