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The US Federal Aviation Administration on Friday issued a ground stop on all national flights . "All departing traffic should remain groundstopped until further notice," the FAA said. The agency said the ground stop is "due to extraordinary circumstance and reasons for safety." In a post on X, US Secretary of Transportation Sean Duffy said the stop was due to a communication issue impacting all Air Route Traffic Control Centers. "FAA technicians are investigating the issue. We will provide immediate updates as we have them." It's the first nationwide ground stop since January 2023, when the FAA dealt with a system outage. Prior to that, the last ground stop was after the September 11, 2001 terror attacks .
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