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.

The airline told the Sun the e-mail was sent to passengers who have upcoming flights to or through Newark’s airport, as well as its MileagePlus

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 Federal Aviation Administration (FAA) continues to grapple with a nationwide shortage of critical aviation personnel, a crisis that’s impacting air travel across the country. At major hubs like Newark International Airport,

We have to fix this, because what you see in Newark will happen in other places across the country,” a top federal official said.