The crucial travel hub for United is still struggling to recover from air traffic control glitches that have already disrupted hundreds of flights.

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 FAA is working on a short-term fix to the problems at Newark Airport that includes technical repairs and cutting flights to keep traffic manageable while dealing with a shortage of controllers.

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

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

"We've turned the corner, and we have the commitment," United Airlines CEO Scott Kirby said of reforms to the Federal Aviation Administration.

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