Originally Posted by
drjazz
It is now near impossible to use a SWU on AF. Since mid-2011, only W & S can upgrade from Premium Voyageur to Affaires. I have checked a total of 50 flights XXX-CDG, and only A bucket is available. Sucks!
A is the discount PV bucket, so if they're selling A, you can purchase W and S, too. Seems best bet is to look for a DL W fare, as they tend to be cheaper than AF W/S fares.