Originally Posted by iwillflytheworld
* SAS. Also a natural choice since it's the only regional * alliance airline and has a comprehensive network. I don't know much about their FF program.
A *A partner seems the logical choice, especially if you want to keep creditting to you UA MP account. I would expect, though not 100% sure, SK might comp you elite status. I'd venture there are far more *A partner options to S. America also than the other alternatives you've outlined and keeping things within the alliance might have more beneficial effects than dividing your earning or switching to OW altogether.
Hopefully you aren't contemplating giving up FT.

Good luck with the change of venue.