Most airlines' decaf is a generic form of Sanka. Now the best coffee I've ever had on a flight is on Delta. Of course it did have Bailey's in it so of course it was good. My main complain with coffee on flights is that is too watered down. The best unadulterated coffee I had was on AirTran and on ASA. They use the same brand of coffee (Royal Coffee) and it's quite good. Delta uses Caribou Coffee, and it's pretty good if the FA's don't water it down.