Facing mounting flight disruptions at Newark Liberty International Airport, United Airlines is urging the Federal Aviation Administration to reinstate flight caps to alleviate congestion and improve safety.

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. Several controllers also went on trauma leave after that outage, worsening the existing shortage.

A technology outage took out radar and communications for Newark Liberty International Airport’s controllers briefly Friday morning, the second such breakdown in two weeks at a heavily trafficked U.S.