Originally Posted by
fifty_two
as far as i know you cant , cause the problem is from who sold you that ticket and what code it has
Yes , in theory thats how it works , i know DL/KL/AF have a specific relationship that goes beyond skyteam membership , especially on transatlantic routes between USA and europe , but i dont think it will allow you to use your FB miles to upgrade a DL ticket on a AF flight
Oh, wow, I wouldn't have expected that. Otherwise I would have booked directly through AF as I normally do. Do you think I would be able to upgrade with miles at check-in? Thanks for all your info!