Originally Posted by
mtkeller
I've never flown PV, so I can't advise on that. However, the current state of the DL/AF/KL relationship for upgrades is not at all clear. Any experience prior to September is obsolete, unfortunately.
However, if upgrade inventory returns, it apparently will still be true that at best M B Y (and maybe just B or Y, surely Y should work as a SkyTeam upgrade) will upgrade into PV, which would mean paying a lot for this Y+ cabin. Also, at best the higher PV fares will upgrade into Affaires, their business class.
A better way might be to transfer miles from credit cards or hotel programs into FB and upgrade under their program rules using the inventory available to FB program FFers.