Again, this question would best be directed to the Skymiles thread. I will answer nonetheless, by pointing you to the Skymiles website, which makes explicitly clear that miles upgrades are good on Delta-operated flights, KLM flights, and transatlantic Air France flights. http://www.delta.com/skymiles/use_mi...ards/index.jsp

http://www.delta.com/skymiles/use_mi...x.jsp#upgrades

If you have further questions about how Skymiles work, please post in the Skymiles forum.