Major U.S. air carriers ground flights as mass IT outage affects businesses

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American Airlines, United, Delta are asking the Federal Aviation Administration for a global ground stop on all flights citing communications issues, according to the agency’s advisory page.

This comes after a Microsoft cloud services outage affected operations at low-cost carriers including Frontier Sun Country, though it remains unclear whether the transportation issues were related. Amsterdam’s Schiphol Airport reported a “global system failure at Microsoft” had disrupted flights there.

“Our systems are currently impacted by a Microsoft outage, which is also affecting other companies,” Frontier said in an earlier post on X, adding hours later that the ground stop was lifted and operations were gradually normalizing.

Businesses around the world, including The Washington Post, reported experiencing issues with Microsoft Windows overnight Thursday into Friday, with users reporting “blue screen of death” (BSOD) errors. At least some resumed functioning shortly afterward.

The issues began at 5:56 pm Eastern on Thursday, according to Microsoft.

It said the preliminary root cause appeared to be “a configuration change in a portion of our Azure backend workloads” that “caused interruption between storage and compute resources which resulted in connectivity failures that affected downstream Microsoft 365 services dependent on these connections.” Azure is a Microsoft cloud computing platform.

In Australia, where the outage occurred in the middle of the day, services including banking, police systems and airports were impacted, the Sydney Morning Herald reported.

This is a developing story and will be updated.

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