Newark airport is struggling with radar issues, staffing shortages and construction delays — and travel experts recommend alternative airports as passengers report significant flight disruptions.

Another ground stop at Newark Liberty International left travelers facing a new wave of cancellations and hourslong delays at the New Jersey airport on Sunday. This disruption follows weeks of chaos marked by air traffic communication issues and staffing shortages.

The air traffic control mishap early Friday morning added to disruptions in recent days that have intensified concerns about safety at one of the busiest U.S. airports.

The Federal Aviation Administration (FAA) briefly slowed air traffic at Newark Liberty International Airport on Sunday because a new telecommunications issue affected the Philadelphia facility

United Airlines on Tuesday is unveiling upgraded interiors on new Boeing 787 Dreamliners as it seeks to reassure customers after a series of issues and hundreds of flight disruptions in recent weeks at its nearby hub of Newark Liberty International Airport.

Don't be surprised if the delays, cancellations and safety concerns that have affected Newark Liberty International Airport in recent weeks spread to the rest of the U.S. That's according to Transportation Secretary Sean Duffy, who on Sunday said "antiquated systems" at major airports across the country need a multibillion-dollar overhaul.

Flights in and out of Newark Liberty International "one hundred percent" need to be scaled back, Transportation Secretary Sean Duffy told NBC on Sunday morning - just as the glitch-plagued airport experienced another service outage over aging communications tech.

The nation’s air traffic controllers union says the flight cancellations plaguing Newark Liberty International Airport in new Jersey and spilling over to U.S. airports can be traced to a week ago when controllers temporarily lost contact with planes.