<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by mauld:
Ok, ok I understand about the reasons for no complimentary upgrades, but what about playing a Delta form of HoKeY?? As a Platinum with lots of CO miles, I'm more interested in "how/& if" mileage upgrades on DL international flights would work. Say I wanted to do a JFK-NCE or ATL-SCL on DL, it sure would be nice to upgrade on whatever their upgradeable/HoKeY'ish fare's were using miles. Any chance of that happening, do we suppose??? 
</font>
If it's not already part of the program, I'm sure we will be able to redeem CO miles for reward tix/upgrades on DL flights. It's the complimentary elite upgrades on domestic flights that will likely never cross over.