Transportation Secretary Sean Duffy announced Wednesday afternoon that he will be reducing flight capacity by 10% at 40 major airports starting Friday morning, affecting roughly 3,500 to 4,000 flights daily.

It was not immediately clear which airports would be affected.

"This is proactive," Duffy said in a news conference.

Federal Aviation Administration Administrator Bryan Bedford said additional measures could be taken after the initial reduction.

"As we slice the data more granularly, we are seeing pressures build in a way that we don't feel, if we allow it to go unchecked, will allow us to continue to tell the public that we operate the safest airline system in the world," Bedford said Wednesday.

Bedford added that the administration will be meeting with the airline community to d

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