The delays continued at Newark Liberty International Airport on Monday evening with average backups of more than 1 1/2 hours.

Newark Liberty International Airport in New Jersey has been dealing with nonstop delays and flight cancellations due to outdated equipment and air traffic control understaffing across the U.S.

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

That first radar outage led to hundreds of flights being canceled or delayed at the Newark airport in the past two weeks after the FAA slowed down traffic at the airport to ensure safety. Five controllers also went on trauma leave after that outage, worsening the existing shortage. It’s not clear if any additional controllers will go on leave now.

Travel woes at Newark Airport continued Monday after a weekend featuring another radar outage, a ground stop and dozens of flight cancellations and delays. The FAA announced Newark was operating on a ground delay program,

Sen. Andy Kim, a New Jersey Democrat, said the FAA is not being transparent enough after visiting air traffic controllers in Philadelphia and Newark.

Newark approach lost radar and comms with at least 16 commercial jets. Many circled in oval loops before landing elsewhere. A CNN data analysis reveals the ripple effects from the outage.

FAA does not provide details about the third reported equipment outage impacting flights Sunday at Newark Liberty International Airport.