Originally Posted by
pete4212
It looks like you found the information on the website and answered your own question as to what KLM Z class is:
If it said "Upgrade with DL SWU/Global Upgrades (Z)" I would understand that is what Z is, but the phrase "and fare class" confuses me. Maybe I'm inappropriately parsing the sentence, but I still don't quite get what the "and fare class" means.
Doesn't matter.