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Nov 3 (Reuters) - Transportation Secretary Sean Duffy said Monday the Trump administration would shutter the U.S. aviation system if he thought an ongoing government shutdown was making it unsafe to travel. "If we thought that it was unsafe... we'll shut the whole airspace down. We won't let people travel. We're not there at this point. It's just significant delays," Duffy told CNBC, adding "absolutely there's more risk" during the ongoing shutdown. Sign up here. Reporting by David Shepardson Editing by Ros Russell
