The Federal Aviation Administration 's unprecedented order to scale back flights nationwide because of the record-long government shutdown took effect Friday morning, with some passengers trying to figure out backup travel plans.

The 40 airports selected by the FAA span more than two dozen states and include hubs such as Atlanta, Dallas, Denver, Los Angeles and Charlotte, North Carolina, according to the order.

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In some metropolitan areas, including New York, Houston, Chicago and Washington, multiple airports are being impacted, while the ripple effects could reach smaller airports as well.

Airlines scrambled to adjust their schedules and began canceling flights Thursday in anticipation of the FAA's official order, while travelers wait

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