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Delta Global Upgrades
This is regarding your 2016 post of the ability to use discount airfares on KLM for Delta Global Upgrades. I just tried to do this using the process described above (ExpertFlyer queries, etc.) and using Google flights to find a cheap fare. I found a match between these two sites for an $1800 ticket. I called Delta and they agreed with the inventory availability but said that only Y tickets were available for upgrade: $5K plus. What have you seen recently? How can I confirm the new terms you found in 2016?