Even though the U.S. has a stark shortage of air traffic controllers, ones who call in sick instead of working without a paycheck during the federal government shutdown risk being fired, the U.S. transportation secretary warned.

Transportation Secretary Sean Duffy said this week that he understands the controllers' frustrations and worries. But during an appearance Thursday on Fox Business, he said that by calling in sick they are causing major disruptions to air traffic, and it won't be tolerated.

“If we have some of our staff that aren’t dedicated like we need, we’ll let them go,” Duffy said, noting that more than 90% of controllers have been showing up to work during the shutdown. "... It’s a small fraction of people who don’t come to work. They can create this massive disruption. And

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