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.

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.

A backup software system at Newark Airport prevented a third radar outage, ensuring operations continued despite the primary system failing.

A brief radar outage for Newark Liberty International Airport is the latest in a string of air traffic control failures tied to aging infrastructure.

"It is safe across the country and the back up procedures keep it safe," United CEO Scott Kirby said on Tuesday

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.

Audio transmissions captured air traffic controllers alerting at least two incoming planes that the radar screens had gone dark.

There was another air traffic control outage in less than two weeks at the same Philadelphia facility that directs planes in and out of Newark Liberty International Airport on Friday morning.

Newark Liberty International Airport in New Jersey has been dealing with nonstop delays and flight cancellations due to outdated equipment and air traffic control understaffing across the U.S.

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,