Thanks Guys
This is def the case - I fly alot but rarely use one carrier exclusively or if I do its never for very long. In the one world case I have much more AA miles than anything else but I rarely if ever fly AA as most miles come from AA CCard! (not sure if this makes a diff).
its my first time on Finnair - but as it has great/convenient biz class deals from my current base, I may be using Finnair much more in the future . . .
Maybe this changes view but . .let me know
Rgds