L-1011,

Welcome to AA! I made the same switch a few years ago and haven't regretted it. In my experience, the lowest AA fare PLUS the cost of purchased upgrade credits, if I have to buy them, has always been below Delta's least expensive upgradeable fare. (Granted, that is a function of my travel patterns and does not necessarily reflect anyone else's situation.)

"Simply good business" cost them DL business, plus that of several colleagues and family members who follow my choice of airlines.

And now back to our regularly scheduled topic...