If flying codesshares (AY code on BA or AA) booked on AY website - will I get points of the operating carrier or marketing carrier? I know this must be asked a thousand times but I can´t find the results.

Also how is it about book on AA but fly with AY all the way?

There are offers to the US and funny enough, I can book cheap BA flights on the AY website (1000€ less then AY operated) or I can book everything on AY metal but with AA code on the AA website (also 1000€ cheaper then AY website). So essential I won t be able to book with AY when I want to fly on AY unless I pay 1000€ more.