I'm confused why you're suggesting I joint both AA and Qantas frequent flyer programs.

Isn't it best to build all my miles with one airline if I can, like AA ? And since Qantas codeshares with AA, I simply feed my AA frequent flyer number to Qantas on each of those legs.

What am I missing? Are you folks saying that as soon as I reach Premier status on AA, that I should then try to build such status on Qantas?