Staff shortages and equipment failures at Newark Liberty International Airport have raised safety concerns in recent weeks.

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 about 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.

United Airlines executives are trying to reassure their customers it is safe to fly at Newark Liberty International Airport​, despite all the recent problems.

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 Trump's administration wants to replace.

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.

Democratic candidates for New Jersey governor sparred on the issues at a debate Monday night. In a debate hosted by NJ PBS and WNYC, Newark Mayor Ras Baraka, Jersey City Steve Fulop, Rep. Josh Gottheimer,