<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Spiff:
You're getting restricted Biz (D fare so it's really restricted J) for less than unrestricted Y. I think Delta's search engine wants to make sure you start your trip in the back and collect more $$$. 
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...and to call it
Best Fares!!! Funny, since most of the things work pretty well with their website.