More than 800 flights were called off across the US on Friday, according to FlightAware. Photo: EPA PHOTO

Hundreds of flights have been cancelled across the US as airlines begin complying with the Federal Aviation Administration's unprecedented order to scale down routes nationwide because of the government shutdown.

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While the agency order left some passengers scrambling to figure out backup plans, most were relieved to find their planes still on schedule as airlines slowly phased in reductions at the nation's busiest airports.

The 40 airports selected for the slowdown span more th

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