Originally Posted by
KLouis
I think I may have bad news for you. I looked in the LX search engine for business upgrade fares ATH-AMS and, all the way till November none was available. Moreover when trying to get to the "Business upgrade in Greece" page you get the ominous reply:
The requested page could not be found.

Perhaps do some digging in the LX forum, you never know...
That is too bad indeed. I noticed they do offer 500 euro rt fares in Z. Which would be a little bit more than economy + 200 euro upgrade fees, but the difference is small.
Now the tricky part of figuring out how to book with the ZRH-GVA segment included. I have flown this exact itinerary in the past (also in Z) but I find it very hard to get their website to price out an itinerary - only full fare business is offered when adding this ZRH-GVA segment.