The US transportation department said on Tuesday it was opening an investigation into Delta Air Lines after the carrier canceled more than 5,000 flights since Friday as it struggles to recover from a global cyber outage that snarled airlines worldwide. From a report: While other carriers have been able to resume normal operations, Delta has continued to cancel hundreds of flights daily because of problems with its crew scheduling system. Since Friday Delta has been cancelling 30% or more of its flights daily through Monday, axing 444 flights on Tuesday, or 12% of its schedule as of 11.00am and delaying another 590, or 16%, according to FlightAware, after cancelling 1,150 on Monday. The transportation secretary, Pete Buttigieg, said on Tuesday the investigation was to "ensure the airline is following the law and taking care of its passengers during continued widespread disruptions ... Our department will leverage the full extent of our investigative and enforcement power to ensure the rights of Delta's passengers are upheld." Delta said it was in receipt of the USDOT notice of investigation and was fully cooperating. "Delta teams are working tirelessly to care for and make it right for customers impacted by delays and cancellations as we work to restore the reliable, on-time service they have come to expect from Delta," the airline said.

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For the third straight day, "More than 1,000 US flights have been," reports CNN, "as airlines struggle to recover from a global tech outage that left thousands of passengers stranded at airports." More than 1,200 flights into, within or out of the United States were canceled by early Sunday afternoon, while more than 5,000 U.S. flights were delayed, according to the tracking website FlightAware.com... On Saturday, 2,136 US flights were canceled, and more than 21,300 flights were delayed... USA Today notes that Friday several U.S. airlines issued ground stops (according to America's Federal Aviation Administration) "which caused a domino effect into Sunday." They note that "most of the cancellations and delays Sunday are likely to be caused by airline crews and equipment being out of place."

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Microsoft grappled with a major service outage, leaving users across the world unable to access its cloud computing platforms and causing airlines to cancel flights. From a report: Thousands of users across the world reported problems with Microsoft 365 apps and services to Downdetector.com, a website that tracks service disruptions. "We're investigating an issue impacting users' ability to access various Microsoft 365 apps and services," Microsoft 365 Status said on X early Friday. On its status page for Azure, Microsoft's cloud computing platform, the company said the issue began just before 10 p.m. ET Thursday, affecting systems across the central U.S. In an update, Microsoft said it had determined the cause and was working to restore access to its users.

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