U.S. airlines began canceling hundreds of flights Thursday due to the Federal Aviation Administration’s order to reduce traffic at the country’s busiest airports starting Friday because of the government shutdown.

More than 500 flights scheduled for Friday were already cut nationwide, and the number of cancellations climbed steadily throughout Thursday, according to FlightAware, a website that tracks flight disruptions.

The FAA order to cut flights at 40 of the busiest airports across the U.S. includes New York, Los Angeles and Chicago, according to a list distributed to the airlines and obtained by The Associated Press. But the impact will disrupt travel at many smaller airports too.

The FAA seeks to reduce service by 10% across “high-volume” markets to maintain travel safety as air tr

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