Originally Posted by
Rambuster
I though only the metal flown is relevant for the mileage accrual ? Although, I agree there are some anomalies in the system.
Mostly, but you might run into problems with the booking class when you fly economy (150% vs 100% vs 50% credit). You only know the booking class of the code share airline, but what matters is the booking class of the metal airline which you don't know.