So what about combined bookings? Say I buy a round trip flight HEL - CLT through Finnair. I can't get a direct flight so I buy one with a layover in LHR:
1st flight is AY native (HEL - LHR)
connecting flight is a codeshare flight, AY 5*** (LHR - CLT).
As per the new avios rules, avios would be calculated by spent money and tier factor on the first leg and by flown miles and ticket type/booking class on the second one. I only get one price for the whole ticket, so how to check how much avios to expect?