US airlines have cancelled more than 2100 flights mostly because of the government shutdown and the Federal Aviation Administration's order to reduce air traffic.

The slowdown at 40 of America's busiest airports is now in its third day and beginning to cause more widespread disruptions. That includes more than 7000 additional delays on Sunday, according to FlightAware, a website that tracks air travel disruptions.

More than 1000 flights were cancelled on Friday, and more than 1500 more on Saturday.

Transportation Secretary Sean Duffy warned that US air traffic could "slow to a trickle" if the shutdown if the federal government shutdown lingers into the busy Thanksgiving travel holiday season.

The Federal Aviation Administration last week ordered flight cuts at the nation's busiest airp

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