Any company is required to make public a basic accountancy result, but I don't know how detailed it must be. We'd at least get gross revenue and expanses, so if profitability can be controlled (as Falco pointed out), the gross revenue can't.

I'll try and find it online, but it's probably only available in paper format. But it's definitely publicly available. There are less obligations than if it were a publicly traded company, but there is still a basic obligation. I'll try and find more. Maybe it's simply mentionned in consolidated accounts for AF/KLM ?