Transportation Secretary Sean Duffy insists it will be "safe to fly" as millions of Americans head into the Christmas travel rush — even as the nation’s top aviation regulator delivered a stark warning that U.S. air traffic control towers will never reach full staffing levels."You saw that as we were getting into the last days of the shutdown, we reduced the capacity of airlines by 10% because we saw the trend lines going in the wrong direction. We will take whatever steps are necessary to make sure the airspace is safe," Duffy told FOX Business' Maria Bartiromo on Thursday."So, as we look to...

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