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Airports in New York, Los Angeles and Chicago along with hubs across the U.S. are among the 40 that will see flights cut starting Friday due to the government shutdown, according to a list distributed to the airlines and obtained by The Associated Press.

The Federal Aviation Administration said Wednesday that it will reduce air traffic by 10% across 40 “high-volume” markets to maintain travel safety as air traffic controllers exhibit signs of strain during the ongoing government shutdown.

Here's the latest:

Passengers should start to be notified about cancellations Thursday

Airlines said they would try to minimize the impact on customers, some of whom will see weekend travel plans disrupted with little notice.

United Airlines said it would focus the cuts on smaller regional routes that use smaller planes like 737s. United, Delta Air Lines and American Airlines said they would offer refunds to passengers who opt not to fly — even if they purchased tickets that aren’t normally refundable.

The head of Frontier Airlines recommended travelers buy backup tickets with another airline to avoid being stranded.

The FAA is imposing the flight reductions to relieve pressure on air traffic