According to this thread on FlyerTalk, Delta has asked ExpertFlyer to remove visibility to its elite upgrade inventory, booking classes RU/OU. I’ve forgotten most of what I once knew about Global Distribution Systems (GDS), but I wonder if the well-penciled bean counters at Delta finally figured out that this was costing them a couple pennies per transaction? If so, one has to wonder what comes next? I did use the upgrade inventory capabilities of ExpertFlyer quite often, but this isn’t fatal for me. The answer was almost always a big “0” anyway. YMMV.
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