My only experience thusfar has been as a Sky Team member. As such, it was simple to request transfer to a partner airline and, space allowing, one could book award travel. Our last use was ATL-GVA on AF in F class. Cost was 100K/per. Is there no similar policy using *A? If this is true, than I will be limited to CO as the other members of *A have no arrangement with either AMEX or Marriott.