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As the U.S. government shutdown persists, airlines are continuing to warn customers of potential schedule changes.

As of Thursday at 3:30 p.m. ET, 4,146 flights within, into or out of the U.S. had been delayed, while 420 had been canceled, according to FlightAware.com.

The Federal Aviation Administration (FAA) implemented a flight reduction plan limiting air travel capacity at 40 airports.

FLIGHT CHAOS GRIPS US AIRPORTS AS SOME AIRLINES ADVISE BOOKING 'BACKUP TICKET': SEE THE LIST

Acting Transportation Security Administration (TSA) Administrator Adam Stahl told Fox News Digital Thursday that as the shutdown persists, there will continue to be a significant impact on wait times amid officer callouts.

"While [officers are

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