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.

The Newark airport had hundreds of flights delayed following a telecommunications issue on Sunday, just two days after a brief outage happened on Friday.

Sean Duffy said the number of flight cutbacks would fluctuate by time of day with most targeting afternoon hours when international arrivals make the airport busier.