Flight delays and cancellations imposed by the U.S. Department of Transportation continued Sunday as some air-traffic controllers skip work since they aren’t being paid during the ongoing federal government shutdown.

Controllers are considered essential workers and have been instructed to continue working despite the shutdown. But after going without paychecks for nearly a month, some have taken second jobs or are calling in sick, compounding existing staffing shortages, National Air Traffic Controllers Association officials told reporters.

Federal transportation officials said this has led to “staffing triggers” at air traffic facilities nationally, leading to “strain on the system.”

To combat the shortages and avoid safety issues, U.S. Transportation Secretary Sean Duffy announced We

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