Surely the rules are those of the airline whose scheme is being used, in this case BAEC for Avios and TPs? And in BAEC the number of Avios earned depends on the marketing airline, not the operating airline?

For example, a BA Gold flying LHR-JFK on a BA-marketed flight in business class may earn 12,103 or 8,645 Avios (for JCD or RI classes respectively), but on an AA-marketed flight will earn 7,767 Avios.