US flight system recovers after nationwide shutdown

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The disruption stranded tens of thousands of travelers and represented the longest nationwide suspension of US flights since the September 11 attacks, according to Reuters. The Federal Aviation Administration lifted the ground stop after roughly four hours, but Transportation Secretary Sean Duffy warned that restoring the aviation network to normal would take time. Airlines continued canceling and delaying flights during the recovery, while officials investigated aging infrastructure and a telecommunications outage as possible causes.[2][5]

Sources: BBC, Reuters