A Frontier Airlines computer system outage led to delayed and canceled flights at Denver International Airport on Thursday night.
Frontier systems were impacted by a Microsoft outage, including booking, check-in, access to boarding passes and some flights, the company said in a post on X.
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Frontier canceled 27 flights at DIA as of 8:15 p.m. Thursday and delayed another 51 flights, according to FlightAware.
There were 570 flight delays and 36 cancellations total, with most of the delays occurring on United and Southwest airlines.
Departing flights for one carrier were being held at the airport until at least 10 p.m. by request, according to the Federal Aviation Administration. The agency did not specify which carrier was holding flights.
This is a developing story and may be updated.
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