Wow, after my second rejection and 3rd try to the DM line, I finally got through to the folks at Chisholm, MN. Today I had ticketed TATL flights for later this summer to Paris with a continuing 7 hr flight to an African country. During the first call I was able to upgrade with SWUs for the TATL flights and also requested upgrades for the AF flights, no can do because no availability on AF. A little confused, I confirmed O availability on EF. Called the 2nd time, different answer, yes it's available but no you can't upgrade, apparent wrong fare class (Y)? Double check and confirm on the Skyteam web site, yes Y can be upgraded. The 3rd call was the charm because I found out because of the price of my ticket it was better to upgrade using miles (20K each way for DL and AF legs) for a total of 40K miles and withdraw the SWU to use on a later flight. Amazing, persistence pays off!