By Rajesh Kumar Singh 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.

United Airlines Holdings expects flight reductions at Newark airport to linger through summer and into fall as the crucial travel hub struggles to recover from air traffic control glitches that have already disrupted hundreds of flights.

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

United CEO Scott Kirby tried to allay trepidations travelers might have about flying in and out of Newark Airport as issues mount.

Air traffic control equipment failures and staffing shortages have fueled mass flight delays, and led the airport’s biggest airline to cancel dozens of daily flights over the coming weeks.

Three incidents at Newark have shaken the public. Meanwhile, the FAA is understaffed. Here's what the Trump administration wants to do about it.

Shares of United Airlines, which has a hub at Newark airport, were down more than 3.1% after the news. The first blackout occurred on April 28 and led some air traffic controllers

Operations are returning to normal after a runway equipment issues prompted ground stops at Newark Liberty and Hartsfield-Jackson Atlanta International airports Sunday, the Federal Aviation Administration announced.