United Airlines executives are trying to reassure their customers it is safe to fly at Newark Liberty International Airport, despite widespread cancellations and air traffic control issues continuing to spark concerns.

Should Newark Airport close until air traffic control upgrades are made? Experts and officials debate safety and the economic impact.

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.

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

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

The FAA said a telecommunications issue at the Philadelphia TRACON Area C facility, which guides aircraft in and out of Newark, caused the agency to issue a ground stop Sunday.