Surprised there's no press release: with AirTran -- perhaps because of their Atlanta ties -- you keep getting press releases like "AirTran is the first US airline to offer the latest Coca-Cola product: Coke with essence of bitterroot and guava."

Dr Pepper has its roots in Texas, which probably explains its local popularity.

http://inventors.about.com/library/i...bldrpepper.htm

I'd guess that CO is adding the product to appeal to local tastes, but perhaps doesn't want to emphasize that it's now serving "imitation" Dr Pepper!