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 said he has a plan to upgrade old air traffic control tech but warned more flight disruptions could come first.

Caught in the middle of the issues at Newark is United Airlines, which is the most active airline at the New Jersey airport. While the problems lie with the FAA system, the airline is where people often aim their frustrations over cancellations and delays.

United Airlines cancels multiple Pittsburgh-Newark flights due to FAA staffing shortages and airport issues. Delays and more cuts expected.

"When a cancellation occurs ... whether they were offering similar waivers or cost-free changes to flight plans. United Airlines CEO Scott Kirby, in a May 2 statement: "These challenges are ...

A missile strike near Tel Aviv’s Ben Gurion Airport and Israel’s airstrike on Yemen’s main airport have forced dozens of airlines to suspend flights.