Welcome to Flyertalk, HKW!

Upgrading international flights using requires a combination of points and a high enough "fare basis" (though there are exceptions).

To really answer your question, we'll probably need to know whether you are ticketed by Air France or Delta, and also the "fare basis" of your ticket (a combination of several letters, starting perhaps with Y, B, M, K, L, U, T, etc as the first letter). You can look on your ticket (if paper) or call the airline.

Then, depending on your answers, the best place to find out what to do next would be either the Air France forum or the Delta forum here on Flyertalk.

Drop me an email (gleff -at- yahoo.com) and let me know which airline's ticket you're using, and I'd be happy to move this post to the correct forum. In the meantime I'm going to close the post here, as MilesBuzz ("the latest frequent flyer program buzz") really isn't the best place for it.

Regards,
Gary
aka gleff
MilesBuzz and Delta moderator