Several equipment outages over the past two weeks at the Philadelphia-based air traffic control center that guides planes to and from Newark Liberty International Airport have raised concerns on how safe it is to fly at one of the nation’s busiest airports.

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

Sunday's incident marks the fourth time in the past two weeks that technical problems have disrupted air traffic at Newark.

CHICAGO (Reuters) -United Airlines is facing a financial hit and potential long-term reputational harm as flight delays and cancellations pile up due to ongoing disruptions at Newark airport - one of its largest hubs and among the busiest in the country.

Transportation Secretary Sean Duffy says a new software update prevented a third radar outage over the last two weeks at New Jersey's busy Newark airport when a telecommunications line failed again over the weekend.

There is more bad news for Newark Liberty International Airport. The FAA wants to keep reducing flights at the troubled airport for months to come.