Travelers flying in and out of Philadelphia International Airport could soon face fewer options — and possible cancellations — as the Federal Aviation Administration orders a 10% reduction in flights in some areas beginning Friday.

The agency says the cut will apply to 40 high-volume U.S. markets, a move FAA Administrator Bryan Bedford called a "radical reduction" designed to ease pressure on overworked air-traffic controllers who have gone more than a month without pay during the ongoing government shutdown .

Philadelphia International is on the list of sites that could be affected , along with airports in Atlanta, Dallas, New York City and Los Angeles, a source told CBS News. However, that is not a final list, and the FAA has not yet issued the formal order.

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