Newark Liberty International Airport suffered another brief air traffic control outage Friday morning, the FAA confirmed.

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.

Duffy laid out an extensive plan to replace the nation’s outdated air traffic control system last week, including installing 4,600 new high-speed data connections and replacing 618 radars, but didn’t put a price tag on the plan other than to say it will cost billions.

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.

Newark Liberty International Airport in New Jersey has been dealing with nonstop delays and flight cancellations due to outdated equipment and air traffic control understaffing across the U.S.

Blank radar screens. Broken air traffic equipment. Flights in an out of Newark Airport delayed or canceled. Is it safe to fly here?

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,