Originally Posted by
wuzziduzziman
The intra EU leg would book in W, not A and earn 125% with FB, as you stated correctly.
The booking class on the EU segment is technically specific to the particular fare, and it theoretically can vary, but spot-checking a few different fares on a few different routes US<->Europe routes on ExpertFlyer, it does seem as if they all currently book into W on segments within Europe.