Originally Posted by
miklcct
In *A, the rule is that the operating carrier booking class decides the miles earned. However, is that true in oneworld? If I buy a codeshare marketed by *A carrier but operated by oneworld carrier, where I should credit my flight?
The rules are set by each individual airline program, not by oneworld as a whole. For example, you're going to earn zero on AA for that flight. That said, typically you would start checking eligibility for the marketing carrier.