Originally Posted by Hoc
Actually, on that particular trip, I am flying AA from LAX-LHR, then connecting to BA with a trip running LHR-MAD-LHR-AMS-LHR. The whole trip (leaving LAX on May 27, returning June 11) cost $696 during a fare sale, with a 50k-miles upgrade (J on the AA legs, and I think F on the BA routes).
OK, you've convinced me that you are misinformed and/or confused.
First off, BA does not offer F on its routes between London and Madrid or Amsterdam.
Second, the 25k (in each direction) upgrade from an economy fare would indded upgrade the AA flight, but it would not upgrade the segments operated by BA, even if it's an AA-numbered (code-share) flight.