It's an interesting thought experiment to consider everything that would have to go into running operations for a business like one of the largest airlines in the world using a non-Internet connected network. Among other things, you probably lose the ability for your employees who aren't physically in the office (which is kind of a lot of them if you're running an airline) from interacting with your operations network. If you're an airline trying to schedule employees and share information with them while they're in hotel rooms, that's probably a deal breaker.

That's really only a secondary problem though, because disconnecting a network from the Internet isn't a replacement for security software or software updates, so you wouldn't even avoid the root cause of the issue here. I'm not saying CrowdStrike is essential software for Internet connected computers either, but if your business thinks it is, you should probably be running it on your "airgapped" computers too. And you should definitely be installing updates, so you can still fall victim to a bad updates regardless of which software you run. At best you perhaps increase the likelihood of hearing about a problem with an update before you deploy it on disconnected computers, but you can get a similar effect by delayed deployment of updates even on Internet connected networks.