Air traffic controllers at Newark Liberty International Airport experienced another outage, losing radar for about 90 seconds early Friday morning. The blackout was due to a telecommunications outage at Philadelphia TRACON Area C, which guides aircraft in and out of Newark airspace. The outage resulted in 246 delays and 66 cancellations at Newark, with staffing constraints and bad weather contributing to the delays. This incident is part of a series of technical problems affecting the air traffic control system in the United States, prompting the Department of Transportation to announce an overhaul of the system.
Source: https://www.wmur.com/article/newark-airport-radar-outage-delays/64727490