Looks very interesting. Apparently it uses its own file format. This is a little bit of a problem, because it forces you to rely on this software to access your notes, even if an export to Markdown is possible. But often times these exports of large note databases are not tidy, they may be missing features/information that didn’t export well.
So i personally would only ever use a note taking app that is based on text files. This of course is harder to manage, but can be done, like VimWiki or Obsidian have shown.
Maybe if it could be extended for text file as basic storage, it could get a broader user base.
It should be added that they likely talk about the controller of the airplanes. Afaik there already is Linux on airplanes, but to handle e.g. the entertainment system. Which seems like a better fit.
Having a non-Linux main controller OS with specific design and a lot smaller feature set than Linux flying the plane seems like a good idea. But maybe this could also be open sourced and standardized?