Just tried booking an intra-Europe flight. On the outbound I want to fly in Business, on the return in Economy.

On the mobile app and the website, I can pick either Eco all the way or Business all the way. Which is i) odd and ii) not consistent because I remember that for other routes I was given a choice between several classes (never did it, but remember seeing that both cabins were offered).

Is there a workaround? Calling them doesn't work, because they either have different fares (when calling the French line) or they are closed (Switzerland).

Thanks for any hint on how to trick the system.