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Microsoft resolves cloud outage that caused some US airlines to ground flights
(www.channelnewsasia.com)
This is a most excellent place for technology news and articles.
It's a crowdstrike issue.
This was a separate outage unrelated to CrowdStrike a few hours earlier that took down a couple of airlines as well.
A majority of the VMs in the Azure CentralUS datacenter went down due to some sort of backend storage issue.
Edit: I guess I should have read the article they do say CrowdStrike. They seem to be implying that they were one event when the cloud services outage was earlier and unrelated. I had heard about grounded flights during the first outage as well. So they likely are combining the two events here.