A staffing shortage, runway construction and deferred maintenance to crucial air traffic technology have made Newark Airport a national laughingstock.

A communications outage affecting flights approaching Denver International Airport is the latest in a series of glitches that have put a spotlight on the nation’s aging air traffic control system.

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

United Airlines on Tuesday said it expects flight issues to ease at Newark Liberty International Airport in the coming weeks as runway construction concludes and the Federal Aviation Administration considers cuts to the schedule.

Airline has trimmed its daily routes following technology and staffing issues affecting New Jersey hub.

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.

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

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