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

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

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

During an interview with CBS News' Margaret Brennan for "Face the Nation," United Airlines CEO Scott Kirby expressed positivity about potential reform and improvement. "This is the most optimistic I've been in my entire career about finally getting the FAA fixed," Kirby said.

Key Takeaways Airline executives, Transportation Secretary Sean Duffy, and officials from the FAA are meeting Wednesday to discuss how to address issues facing New Jersey's Newark Liberty International Airport.