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

The shortage on Monday forced the F.A.A. to delay flights to the busy airport for up to nearly seven hours, the latest problem to plague the airport.

Airline has trimmed its daily routes following technology and staffing issues affecting New Jersey hub.

Passengers traveling through Newark Airport on Thursday again dealt with significant delays due to FAA staffing shortages. In the morning, the FAA was reporting shortages leading to departing flights being delayed by an average of 75 minutes and arriving flights delayed by an average of five hours,

The FAA reported both a ground stop and a ground delay at the Newark Airport Thursday morning due to staffing issues and runway construction.

Newark Liberty International Airport is facing another FAA-imposed ground delay due to staffing shortages, after a telecommunications issue led to delays on Sunday.