Travelers through some of the busiest U.S. airports can expect to learn Thursday whether they’ll see fewer flights as the government shutdown drags into a second month.

The Federal Aviation Administration will announce the 40 “high-volume markets” where it is reducing flights by 10% before the cuts go into effect Friday, said agency administrator Bryan Bedford. The move is intended to keep the air space safe during the shutdown, the agency said.

Experts predict hundreds if not thousands of flights could be canceled . The cuts could represent as many as 1,800 flights and upwards of 268,000 seats combined, according to an estimate by aviation analytics firm Cirium.

“I’m not aware in my 35-year history in the aviation market where we’ve had a situation where we’re taking these kind

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