Over 4,000 flights were delayed on Monday as bad weather and air traffic control shortages created the perfect storm for flight interruptions.

Why it matters: As the second-longest government shutdown enters its fourth week without a clear end in sight, the delays could impact winter holiday travel.

Driving the news: Air traffic controllers won't get a paycheck for their arduous and dangerous work starting Tuesday. • Their last paycheck for work they did in September was also reduced, Transportation Secretary Sean Duffy told reporters last week. • Controllers are essential workers, so they must continue to work even when the government is shuttered.

What they're saying: "The controllers are wearing thin," Duffy said Sunday on Fox News. • "They're taking second jobs, they're out th

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