With a 10% cut in flights coming Friday, O’Hare International Airport ’s two major carriers offered advice to passengers about what to expect on what will be a challenging day for thousands.

The Federal Aviation Administration issued the directive amid a record-length government shutdown that’s led to fewer air traffic controllers. The ones remaining are working without pay.

The order will impact 40 major U.S. airports, including O’Hare, The Associated Press reports.

“We are entering a period in which there are many unknowns,” aviation expert and DePaul University Professor Joseph Schwieterman said.

“One bit of good news is that we are still several weeks away from the Thanksgiving travel rush. I suspect — and hope — the system to be back to normal by then.”

United Airlines

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