Originally Posted by xliioper

This was already answered a few posts upthread -- https://www.delta.com/us/en/skymiles...rline-partners
"SkyMiles Members flying on a partner-marketed flight (excluding basic economy and similar fares) will be able to count flight miles flown toward their Million Miler Status."

It seems pretty clear that anything that qualifies for MQD earn at this point will also count towards MM earn. Basically, it excludes BE fares and flights booked with partner miles (like FB). Also, partner marketed flights on non-Skyteam metal. I guess there's somewhat of an open question on partner Light fares which still earn MQDs, but are definitely "similar" and priced like DL BE fares (the Light fare filings generally duplicate DL BE fare filings on TATL JV routes).