Similar to last summer, there is currently a nationwide shortage of air traffic controllers, which will “take time” to replenish, according to Transportation Secretary Sean Duffy.

Newark Liberty International Airport is facing another FAA-imposed ground delay due to staffing shortages, after a telecommunications issue led to delays on Sunday.

US Transportation Secretary Sean Duffy said that Newark airport would see “several weeks” of reduced capacity as officials grapple with spiraling delays and safety lapses at one of the country’s busiest hubs.

At times Monday evening, as few as three air traffic controllers per hour were lined up to monitor via radar the planes flying into and out of the airport, the Federal Aviation Administration said.

U.S. Secretary of Transportation Sean Duffy is under fire for deflecting blame over the escalating crisis at Newark Liberty International Airport—issues his department has yet to resolve. Critics point to his references to “cracks in the system” nationwide and a so-called “Brand New Air Traffic Control System Plan” that,

Staff shortages and equipment failures at Newark Liberty International Airport have raised safety concerns in recent weeks.

Radar screens that monitor Newark Liberty International Airport in New Jersey went completely black for about 90 seconds early Friday morning, according to a new report from ABC News. The outage comes after an identical problem last week when air traffic control screens for the same airport went dark for about 60-90 seconds.