It's now been more than one week since the federal government shut down, and the impact is now rippling through the skies, with more U.S. air travelers impacted due to staffing shortages at airports.

The FAA reported staffing issues Tuesday at airports in Boston, Dallas, Chicago, Philadelphia and Nashville, where a shortage of air traffic controllers led to the delay of one-third of its flights and affected nearly 40,000 passengers.

Transportation Secretary Sean Duffy acknowledged earlier this week that staffing issues were due to an uptick in the number of air traffic controllers calling in sick.

"Have we had a slight tick up in sick calls? Yes," Duffy said. "And then you'll see delays that come from that, right?"

Any staffing shortage puts extra pressure on controllers who are on the

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