Originally Posted by YVR Cockroach
What fares do you intend to fly on? You have to buy pretty expensive fares to upgrade on AF/KL, NW and CO.
Thanks a lot for letting me know this! I haven't yet understood the fare code of SkyTeam airlines (is there a good table or thread on this topic? I searched but couldn't find one), but if they are similar to those of UA, any non-refundable fares (like M and H on UA) should be ok, while refundable fares (like Y and B on UA) would be too expensive. Please forgive my ignorance if this does not make sense - I'm familiar with UA and other Star Alliance airlines, but I should perhaps learn more about the basic system of the mileage programs of SkyTeam airlines.