I tried booting up the early access release of Chrome OS Flex on my MacBook Air but it's obviously not stable enough yet. It boots and gets to the desktop but then the screen goes black and it crashes completely.
I'm now trying CloudReady instead to see if I get any further.
As I've mentioned before, the MacBook Air is starting to struggle now, it's 7 years old after all, so it could be time to repurpose it.