I have a similar question or actually 2 questions:
1. I am considering doing BKK-HEL-TLL // TLL-HEL-LHR but I don't know if it will be possible to turn around on the same plane in TLL with checked luggage.
I wonder if AY can just check my luggage for BKK-HEL-LHR... I will fly the full tickets to TLL and back (otherwise the HEL-LHR would get cancelled), but it would be easier without luggage.
2. This would be the return portion of the trip. On the outbound, I will take the ferry to TLL and then fly TLL-HEL-BKK. I wonder if AY can check my luggage in HEL, before I have actually gone to TLL and flown back?
I know BA will usually check luggage for LHR-longhaul before flying to e.g. AMS and back