The Federal Aviation Administration’s unprecedented order to reduce flights nationwide amid the record-long government shutdown is taking effect Friday morning.

The Federal Aviation Administration plans to cut flights by 10 percent at 40 airports—including Reagan National, Dulles, and BWI—starting Nov. 7 if the government shutdown continues. The move aims to ease strain on unpaid air traffic controllers but is expected to cause widespread delays and cancellations in the Washington area and nationwide.

The Transportation Secretary has ordered a 10% cut in flights at major airports due to air traffic safety concerns.

The U.S. Federal Aviation Administration said on Friday it was delaying flights at eight airports including in Atlanta, San Francisco, Houston, Washington and Newark, citing widespread air traffic staffing issues as controllers have not been paid during the government shutdown.

Washington state Rep. Dan Newhouse plans to visit the Tri-Cities Airport Thursday to learn more about the impacts of the government shutdown on the airport.

Flights were canceled at Columbia Metropolitan Airport (CAE) in SC following the FAA’s decision to reduce air traffic nationwide amid the government shutdown.

Air traffic control audio shows the communication between the tower and pilots during the bomb threat. The ground stop contributed to flight delays.