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Transportation Secretary Sean Duffy told "Fox & Friends" on Thursday that the decision to limit air travel capacity to 40 airports was "data-driven."

"We were seeing increased pressure, in these 40 markets. And we looked at the data — this was data driven — and so taking 10% of the flights out will reduce that pressure, which is what we want to do," Duffy said.

"Now, does that mean there's going to be no delays? No, Brian," Duffy told Fox News' Brian Kilmeade. "There's potentially still going to be delays if we have staffing triggers, and we don't have enough controllers in an aerospace where we did cut 10%, you might see additional delays."

This is a developing story. Please check back for updates.

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