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.

Air traffic controllers have been under strain for years, but a 90-second equipment failure last week exposed how decades of staffing shortages, underinvestment and patchwork solutions for those who guide planes through some of the world’s most congested airspace are taking their toll.

A communications outage at the Philadelphia Terminal Radar Approach Control affected air traffic at Newark Liberty. This highlights aging infrastructure and comes after Transportation Secretary Sean Duffy's proposal for major upgrades.

Workers at Newark Liberty airport lost communication with planes, now on 45-day leave 'to recover from the stress,' says FAA - Anadolu Ajansı

Several issues have led to delays and cancellations for about a week, and those disruptions were happening again Monday morning.

"The chaos at Newark very well could be a harbinger if issues like these aren't fixed, and if the FAA can't get real solutions ... The flight boards at Newark on Monday told the story: Delays ...

Travelers flying in and out of New Jersey are facing delays again today at Newark Liberty International Airport, which has been plagued for more than a week by serious delays

The FAA said it is working to find solutions for one of the nation's busiest airports at it struggles with staffing challenges and runway repair work.