Transportation Secretary Sean Duffy predicted Tuesday that there could be chaos in the skies next week if the government shutdown drags on and air traffic controllers miss a second paycheck.

There have already been numerous delays at airports across the country — sometimes hours long — because the Federal Aviation Administration slows down or stops traffic temporarily anytime it is short on controllers. Last weekend saw some of the worst staff shortages and on Sunday, flights at Newark Liberty International Airport in New Jersey were delayed for several hours.

Duffy and the head of the air traffic controllers union have both warned that the situation will only get worse the longer the shutdown continues and the financial pressure continues to grow on people who are forced to work without pay. FAA employees already missed one paycheck on Oct. 28. Their next payday is scheduled for next Tuesday.

“Many of the controllers said ‘A lot of us can navigate missing one paycheck. Not everybody, but a lot of us can. None of us can manage missing two paychecks,’” Duffy said. “So if you bring us to a week from today, Democrats, you will see mass chaos. You will see mass flight delays. You’ll see mass cancellations, and you may see us close certain parts of the airspace, because we just cannot manage it because we don’t have air traffic controllers.”

Most of the flight disruptions so far during the shutdown have been isolated and temporary. But if delays become more widespread and start to ripple throughout the system, the pressure will mount on Congress to reach an agreement to end the shutdown.

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