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Hundreds of flights have been canceled as FAA reductions take effect Friday at 40 high-traffic airports, including Philadelphia .

Direction from the Federal Aviation Administration and Department of Transportation to reduce flight schedules come amid safety concerns during the ongoing government shutdown.

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The purpose of the move is to relieve pressure on the national aviation system, where air traffic controllers and TSA staff have been working without pay. Staffing shortages have led to delays across the country.

Airlines said this week, they will communicate with customers on any significant changes to their flights.

Here’s a look at how American, United, Southwest, and Delta a

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