Hi all,
Here's a link to the upgrade information that we have heard of, using cash and miles:
http://www.flyertalk.com/forum/flyin...eable-fee.html
Note: except for possibly one or two outstations, it can only be done at AMS, and you will need to go to the ticketing desk.
I did find a reference to a promo for Nairobi using this scenario:
https://secure.klm.com/travel/ke_en/...ture/index.htm
Finally, for the paid upgrade, I think this will only be offered in the case of an overbooked flight, where, rather than upgrading people for free, KLM will try to make some extra money by offering upgrades during check-in.
Cheers,
GenevaFlyer