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U.S. airlines canceled more than 2,100 flights on Sunday as Transportation Secretary Sean Duffy warned that air traffic across the nation could "slow to a trickle" if the federal government shutdown lingers into the busy Thanksgiving travel holiday season.
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US lawmakers are working over the weekend as they seek a bipartisan deal to end the shutdown, which is now on day 40.
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Airlines will have to slash hundreds of more flights if shutdown continues into next week.
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