A new software update prevented a third radar outage in the last two weeks at New Jersey's busy Newark airport when a telecommunications line failed again over the weekend, Transportation Secretary Sean Duffy said Monday.

Radar screens at New Jersey's Newark Liberty International Airport went black again early Friday morning. The outage happened at 3:55 a.m. and lasted about 90 seconds, the Federal Aviation Administration said.

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 failure was the second such incident in the past two weeks, amid continuing concerns over safety at the airport.

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.