By Alexandra Skores, Pete Muntean

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.

“As we start to implement this draw down in service, it will be restricted to these 40 high volume traffic markets,” FAA Administrator Bryan Bedford said. “We’re going to ask the airlines to work with us collaboratively to reduce their schedules.”

The announcement comes as air traffic controller staffing shortages during the shutdown are delaying an increasing number of flights throughout the country. Controllers will miss their second full paycheck next week and some are taking second jobs to make ends meet or calling in sick in protest.

Controllers, like Transportation Security Administration screeners, are considered essential employees and must work during the shutdown, but are not being paid.

The FAA will meet with the airlines to discuss implementation of the new plan Wednesday night. Bedford called the change “prescriptive” and “surgical.”

“We are going to proactively make decisions that keep the airspace safe,” Duffy said.

“We have asked (air traffic controllers) to show up for work, but I’m not naive to understand that they’re trying to figure out how they meet their daily obligations,” Duffy said. “Because of that, we have seen staffing pressures throughout our airspace. Those who travel will see that we’ve had more delays. We’ve had more cancelations.”

More than 400 staffing shortages have been reported at FAA facilities since the start of the shutdown, according to a CNN analysis. The number is more than four times what was seen on the same days last year.

The airlines were notified of the plan only about an hour before it was announced, an airline source told CNN.

“We are working with the federal government to understand all details of the new reduction mandate and will strive to mitigate impacts to passengers and shippers,” Airlines for America, the industry trade group, said in a statement.

Bedford said the new measures would also go beyond commercial airspace and include restrictions on space launches and small aircraft traffic in certain markets.

“I want to applaud the controllers who continue to come to work on a daily basis keeping our system safe,” Bedford said. “But I also want to recognize the fact that the data is telling us we need to do more.”

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