Washington (CNN) — The Federal Aviation Administration will reduce flights at dozens of major airports as early as Friday if no shutdown deal is reached, Transportation Secretary Sean Duffy announced at a news conference Wednesday.

Ten percent of air traffic at 40 busy airports would be cut, potentially impacting thousands of flights, though the details of how many and which specific airports will be cut was not announced.

The nation’s “core 30” airports – including New York City’s three big hubs, plus major airports in Washington, DC, Chicago, Atlanta, Dallas, and across the West from Phoenix to Seattle – are among those on a preliminary list of sites expected to be impacted by the drawdown, an FAA source with direct knowledge of the situation told CNN.

“As we start to implement thi

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