A global technology outage impacting airports, banks and hospitals around the world continued Friday morning, leading to hundreds of delayed and canceled flights at Denver International Airport.

Cybersecurity firm CrowdStrike said that the issue believed to be behind the outage was not a security incident or cyberattack — and that a fix was on the way. The company said the problem occurred when it deployed a faulty update to computers running Microsoft Windows.

But hours after the problem was first detected, the disarray continued — and escalated.

Denver first noticed an issue Thursday night when Frontier Airlines announced its systems were being impacted by a Microsoft outage, including booking, check-in, access to boarding passes and some flights.

Frontier asked the Federal Aviation Administration to issue a ground stop for the airline Thursday night, which was lifted around 10:18 p.m., according to the airline.

Friday morning, issues at the airport continued with 140 flights being delayed and 61 flights being canceled by 7:15 a.m.

According to the FAA, flights headed to Atlanta, Georgia and Minneapolis, Minnesota were experiencing average flight delays of more than an hour as of 7:15 a.m.

Southwest led the charge Friday morning with 68 flight delays, and 33 United flights failed to leave the gate on time, according to data from flight tracking software FlightAware. Regional airline SkyWest, the airline that operates United Express, also delayed 15 flights.

United had the most flights canceled Friday morning, with 38 flights, followed by Delta’s 12 canceled flights.

Southwest, United, Delta, Frontier, SkyWest, American Airlines, Icelandair, Swiss, WestJet and Air France all canceled or delayed flights Friday morning.

“A third-party outage is impacting computer systems, including at United and many other organizations worldwide,” United Airlines said in a statement on social media at 4:26 a.m. Friday. “As we work to fully restore these systems, some flights are resuming. Many customers traveling today may experience delays.”

American Airlines — who delayed three flights and canceled four Friday morning — also confirmed they were affected by the outage. The airline said it resumed normal operations around 3 a.m. Friday.

Microsoft 365 posted on social media platform X that the company was “working on rerouting the impacted traffic to alternate systems to alleviate impact” and that they were “observing a positive trend in service availability.”

CrowdStrike CEO George Kurtz said in a statement on X that the company “is actively working with customers impacted by a defect found in a single content update for Windows hosts.”

He said: “This is not a security incident or cyberattack. The issue has been identified, isolated and a fix has been deployed.”

More than 800 flights were canceled or delayed at DIA Thursday.

Airlines delayed 739 flights and canceled another 62, according to FlightAware data.

Southwest and United had the most flight delays, with 272 and 206 flights delayed respectively. Frontier took first for most flights canceled — 37 flights — at approximately 20% of all Frontier flights taking off from DIA.

The Associated Press contributed to this report. 

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