I've scanned the threads and read and re-read the AA advisory, but still unclear about how loyalty points accrue for codeshare flights. For instance, if I book a round trip on BA.com for LAX to MAD in which all flights have BA flight numbers, but the LAX-LHR and LHR-LAX legs are on AA metal, are the loyalty points for the LAX-LHR and LHR-LAX legs based on actual mileage multiplied by your elite status multiplier or incremental cost of the AA metal legs multiplied by elite status multiplier. AA.com appears to favor the former, while some of the threads favor the later. Any advice or experience is greatly appreciated.

From a mechanics perspective, accruing Loyalty Points under the new system is really no different than accruing EQM/EQD under the old system with regards to flights.

If you book BA flight numbers then you accrue LP's according to the BA Earning Table at aa.com.

According to my recent conversation w/ an EXP Desk rep, if AA-metal flights have BA flight numbers, they will be treated as BA flights. If they are ticketed w/ AA flight numbers, however, regardless of where you made the purchase, you will be eligible for elite-status multiplier, etc.

Thank you JJEFFREY and nyc10036. The AA advisory supports your conclusions. I will pull the trigger and book a PE ticket on BA using AA metal. The price on BA.com is cheaper, plus I get the AARP and Visa discounts if I purchase on ba.com. The only drawback is that I wont enjoy the complementary or systemwide upgrades [I'm an AA ExPlat] on AA metal. My calculations revealed that, assuming our conclusions are correct, I'll earn more that twice as many loyalty points if I book on ba.com.

eg. ticket on AA.com costs approximately $1100 minus taxes = $900 x 11 = 9900 loyalty points.

Similar ticket on ba.com costs approximately $970, books in fare code T which gets 100% of base miles mutllied by EXPlat bonus of 120%. Distance for trip both ways total approx. 12000 miles. 12000 x 120% = 14,400 + 12000 = 26400 loyalty points.