A problem with Microsoft’s Azure system also hit check-in and booking systems at Allegiant and Sun Country Airlines.
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.
Airlines sometimes issue these orders to temporarily halt flights because of technical issues.
Frontier did not specify how many flights and passengers have been affected so far. The Denver-based airline operates a fleet of more than 100 planes, according to its website.
The Microsoft outage hit at least two other airlines.
“One of our information vendors is experiencing a global outage affecting multiple airlines. As a result, some of our services are temporarily unavailable,” Sun Country said.
Allegiant said on X that customers may face problems with check-ins, bookings and issuing boarding passes.
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