Hi,
I booked two tickets CDG-JNB (AF990) on 16/09/19. Both tickets are economy (R class). I am Sliver, fellow traveler Explorer. Tickets bought online on French Air France website. I also includes a flight back but CPT-AMS-CDG (so, with KLM).

I'm looking for the different possibilities to upgrade. After reading a lot on FT (including this interesting thread Trying to Understand Upgrade Availability for AF), I still have some questions.

• When I manage my reservation on AF website, I have the upgrade button, but it says no seats are available for upgrade
• I asked Flying Blue on Facebook Messenger, same answer
• I checked Expert Flyer, it says 0O, 9C

After reading the above thread, it says that no O availability on EF doesn't mean that there is no seat upgrade available for Flying Blue members but that KVS can show them, under CS class code. I don't have KVS so I couldn't check.

• Does it worth to pay for KVS and check if any CS exists?
• Is it likely that new CS/O seats will appear, knowing the flight is in 3 weeks?
• Is my understanding correct that CS is a class available for miles upgrade?
• Is it correct that upgrades proposals from AF are targeted, sent just before the check-in? And/or also during the check-in process?

After reading on FT, my understanding is that the amount of miles for an upgrade isn't as variable as for the award tickets. Then, if someone has an estimation of miles needed for upgrade on CDG-JNB, I'll take it!

Also: I read a lot "DoD upgrades". What does that mean? I couldn't find it on FT glossary.