What to know about canceled flights across the U.S.:

Airlines are expected to cancel 6% of their flights at 40 of the busiest airports in the U.S. on Tuesday to comply with an order from the Federal Aviation Administration amid the government shutdown — an increase from earlier 4% cutbacks.

Officials said the FAA order was an effort to address strain on the national airspace system as the agency dealt with a shortage of air traffic controllers. Secretary of Transportation Sean Duffy said he hoped a deal to end the government shutdown would be successful and lead to air travel returning to normal, but warned that fixes would not be immediate and that safety officials would have to watch for certain data benchmarks.

As of Tuesday afternoon, more than 1,200 flights had been can

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