WASHINGTON — U.S. airlines canceled more than 2,700 flights on Sunday as Transportation Secretary Sean Duffy warned that air traffic across the nation would "slow to a trickle" if the federal government shutdown lingered into the busy Thanksgiving travel holiday season.

What You Need To Know

U.S. airlines canceled more than 2,700 flights Sunday mostly because of the government shutdown and the Federal Aviation Administration's order to reduce air traffic

The slowdown at 40 of the nation's busiest airports was in its third day and beginning to cause more widespread disruptions

That includes nearly 10,000 additional delays Sunday alone, according to FlightAware, a website that tracks air travel disruptions

Earlier Sunday, U.S. Transportation Secretary Sean Duffy warned that U.S. air tra

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