I'm sure this is discussed someplace but I can't find it: If I book a Delta-operated but AF-coded flight to Europe, can I use my status to select Comfort+ on the DL metal TATL flight? I believe I've read that there are no C+ upgrades on Delta-operated, partner-coded flights, but Europe flights don't use the C+ upgrade system and PMs can just select a C+ seat at booking (when booking at the DL code at least). Is this possible when booking the AF flight number for DL-operated Europe flights?