Originally Posted by
MSPeconomist
I thought the rule was that you don't earn for a codeshare other than DL that's operated by a carrier that doesn't belong to SkyTeam (versus not a DL partner). So AFAIK if you have an AF flight number for a flight operated by VS, it would earn nothing in the DL FF program even though DL and VS have a bilateral partnership.
True. Really best practice is to read the small print at the bottom of the partner page for whatever marketing airline you're booking with, because there are other possible complications as well. For example a 9W-marketed, AF-operated flight also earns no Delta miles despite being operated by a Skyteam member.