Frontier Airlines briefly grounded all flights on Thursday amid a major outage in Microsoft networks, which also knocked out some computer systems at low-cost carriers Allegiant Air and Sun Country Airlines.
Microsoft said on the status page for Azure, its flagship cloud computing platform, that the problem began at 5:56 p.m. and affected multiple systems for customers in the central United States.
“Our systems are currently impacted by a Microsoft outage, which is also affecting other companies. During this time booking, check-in, access to your boarding pass, and some flights may be impacted,” Frontier said in a post on X.
The airline issued a ground stop for all its flights, according to a notice posted on the Federal Aviation Administration’s website. The ground stop was lifted about 35 minutes later.
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