Originally Posted by
PlowJockey
Sadly, there is no "only". Both exclusions are true.
I'm very surprised if BA/IB/AY codeshares on Atlantic Joint Venture tickets really can't be credited to Alaska, although that's clearly excluded in the current rules. Exception being AA codeshares likely due to AS's closer relationship with AA. Seems like a relic of pre-OW AS days that hopefully gets fixed as AS fully integrates into OW. Looking at Wayback, AS used to exclude AA codeshares except for TATL BA operated flights until 2018.