Major U.S. airports struggled Tuesday as flight delays mounted amid a staffing crunch caused by the GOP’s ongoing government shutdown. Transportation Secretary Sean Duffy predicted the shutdown could throw flights into chaos—and that warning is coming true.

The Federal Aviation Administration reported Monday that no air traffic controllers were available at Hollywood Burbank Airport in California, grounding some flights and causing ripple effects nationwide. Staffing-related delays also hit airports in Newark, Phoenix, and Denver. CNN reports that air traffic control centers serving Jacksonville, Chicago, and Washington, D.C., were also short-staffed, while the Nashville airport’s air traffic control center was forced to shut down for five hours on Tuesday night.

FAA officials have not y

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