Originally Posted by
a mirrer
there are a lot of differences between ba code and aa code for avios for example a OW LHR-JFK in S class on BA earns 1729 avios and on AA earns 863 avios in business and first class the differences are even bigger
Correct - there can be significant differences between avios earning on BA codes vs AA/IB codes.
Easiest is to check on the avios calculator. Enter the marketing airline, not operating airline, to get the right figures.