Maybe I've missed it, but I can't recall any discussion here on how the OnePass elite upgrade program will work on Delta. It seems like there may be NO upgrades, or they will be restricted to the higher fare tickets -- just like Delta does to its own elite customers. CO has already announced that OnePass Elite qualification will follow Delta's complicated fare classification rules.

Personally, as a CO Platinum, Delta will only be a "last resort" back up carrier for me if they don't offer the upgrade opportunity.