Originally Posted by
Dr. HFH
Why not? The only things that determine how flights accrue to an airline frequent flyer program are the marketing carrier, the rules of the program to which you're crediting and the fare you're on. The issuing/plating carrier is irrelevant.
On a side note, I just learned that Matt's Planet is a source of this misinformation.. he recommends that one should plate RTW on BA if they want to credit to AY+...etc