Originally Posted by
Concerto
Yes indeed, a flight on DL credited to Flying Blue will extend the validity of your miles, and the same goes for flights on any SkyTeam airline when crediting to FB.
if booked in an earning class/fare for FB. Do not forget that even with the new rules of FB, partner flights booked under their codes will continue to follow the current earning scheme.
For DL, I think all fares were earning on FB but I have a doubt regarding the "light fares" DL introduced about a year ago on domestic flights.