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Thousands of U.S. flights canceled amid FAA's flight reductions during government shutdown.

Transportation Secretary Sean Duffy warns air travel will worsen before Thanksgiving, affecting travelers, whether or not the shutdown ends.

President Donald Trump urges air traffic controllers to work; union demands pay and recognition.

SALT LAKE CITY — Following the Federal Aviation Administration's announcement last week about reducing flights at major airports across the U.S., thousands of flights were canceled over the weekend, and the cancellations will continue this week.

On Sunday, Transportation Secretary Sean Duffy warned that the air travel cancellations and delays would continue to spread.

"It's only going to get worse," Duffy said,

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