Originally Posted by
Dr. HFH
On the using AA flight number for JNB/CPT-LHR segments, this is obviously of increased interest since the new rule of no elite level bonus AAdvantage mileage when traveling on BA except when on an AA codeshare flight number.
You would, however, give up the ability to preselect seats on BA via MMB (at least as I understand it). I think I'd rather be able to go for row 62 than gain the extra miles.