The Federal Aviation Administration imposed a nationwide ground stop at all U.S. airports Friday because of a communications problem affecting every air traffic control center. Aircraft already in the air could land, but planes still on the ground were unable to take off. Transportation Secretary Sean Duffy blamed the outage on a telecommunications failure, while Homeland Security Secretary Markwayne Mullin ruled out a terrorist threat. At the same time, several European airlines faced a wave of phony bomb threats, including one flight diverted to a military base in France. Microsoft said it had no indication that its global outage was connected to the FAA ground stop.
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