WASHINGTON (AP) — Air traffic in the U.S. could “slow to a trickle” if the federal government shutdown lingers into the busy Thanksgiving travel holiday season, Transportation Secretary Sean Duffy warned Sunday.

The Federal Aviation Administration last week ordered flight cuts at the nation’s busiest airports as some air traffic controllers, who have gone unpaid for nearly a month, have stopped showing up for work.

The reductions started Friday at 4% and will increase to 10% by Nov. 14. They are in effect from 6 a.m. to 10 p.m. local time and will impact all commercial airlines.

On Sunday, more than 1,700 flights were canceled as of 1:30 p.m. Eastern time and nearly 5,000 flights were delayed, according to the aviation tracking website FlightAware. That follows more than 1,500 can

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