More than 800 flights had already been canceled across the United States first thing Friday as the Federal Aviation Administration’s unprecedented order to cut flights at 40 of the nation’s busiest airports was set to take effect.

Travelers were bracing for travel chaos at major airports across dozens of states – including all three New York City-area hubs – after the feds ordered airlines to slash 10% of their flights starting from Friday as the government shutdown rages on.

Airlines were already scrambling to adjust schedules and began scrapping flights in anticipation – as scores of travelers waited nervously to see if their planes would be canned or plagued by lengthy delays.

Over 815 flights had been called off nationwide and more than 550 were delayed as of 7 a.m. on Friday, a

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