Of note, unlike when booking on delta.com, when booking an itinerary with a domestic portion on airfrance.us (ex SAN/CDG through JFK), the domestic portion is not eligible for medallion upgrade. For medallions who want to upgrade the domestic portion but have to buy W/S on airfrance.us (because W not available on delta), I would recommend splitting the ticket in two: Buying the domestic portion on delta.com and the TATL portion on airfrance.us.
This has not been my experience. I had a ticket MEM-ATL-CDG-CPH and on the MEM-ATL portion I received a complimentary medallion upgrade.