The Federal Aviation Administration announced another ground delay at Newark Liberty International Airport on Tuesday morning.

The ground delay will remain through midnight, and the average delay is two hours and 41 minutes. The delay marks the ninth straight day of staffing shortages at Newark airport, which have caused significant disruptions.

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Hundreds of flights have been delayed or canceled in and out of Newark, the nation’s 14th busiest airport, for the last week and a half. 

In addition to one runway being closed for construction, the airport lost 20% of its air traffic control staff when they walked off to protest staffing shortages that were causing burnout.

The controllers in Philadelphia Terminal Radar Approach Control, which coordinates planes arriving at Newark, “temporarily lost radar and communications with the aircraft under their control, unable to see, hear, or talk to them” for 30 seconds, according to a CNN report. 

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The connectivity “completely failed” between FAA radar and the frequencies that air traffic controllers use to handle planes flying in and out of the airport.

At least five air traffic controllers went on 45-day trauma leave “to recover from the stress of multiple recent outages.” The FAA said these people cannot be quickly replaced “due to this highly specialized profession.”