Updated with officials’ explanation of the cause and the reopening of U.S. airspace.
The nationwide ground stop that halted U.S. commercial air travel Friday was not caused by the Microsoft 365 outage that began a day earlier, federal officials said at an evening news conference, blaming aging FAA telecom equipment that was overloaded with data.
Homeland Security Secretary Markwayne Mullin opened the news conference by raising the Microsoft outage himself. “I want to make sure everybody understands that there is no connection between this and Microsoft,” he said. “I know a lot of people are making that jump.”
Transportation Secretary Sean Duffy…
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