Sorry, bedford, I think I asked unclearly. Let me try and do better.
I have an upcoming transat RT purchased through Continental which I expect to earn about 8000 OnePass Miles. I could put the second half on Aegean miles after registering for an Aegean account, which would get me Blue status and the associated *A silver benefits.
HOWEVER: I would only receive those benefits (as I understand it) if and when I registered my Aegean FF# on future flights. Aegean doesn't have great earning, as a rule, and I have a pile of CO/UA miles already. It's likely that on future *A flights I will want to earn with CO/UA. So I think I'd get *A status this way... but never use it.