The Microsoft part of this I find interesting, I mean I guess it would be standard legal practice to also go after them even if it is thrown out. But that one is weird. Maybe Microsoft encouraged Delta to use Crowdstrike, then ok I could see the case. But if it is anything related to how Windows works, that seems like a stretch. Yes Windows could be better, but I don't like the idea that the OS provider could be sued…
I do not believe this will be the last of its nature in our generation. It should very much be already have been accounted for. The basics and fundamentals of information security apply despite what interpretations of insurance policies or certifications say. Let this be a lesson to not introduce single points of failure into critical systems without having prepared for their unavailaility or misbehaviour (yes, that includes your ISPs, cloud, and SaaS providers