Probably not a surprise to anyone here, but DL/AS will end their codeshare this coming May.
DL presser here: http://seekingalpha.com/pr/16696881-delta-alaska-airlines-will-end-partnership-may-2017
DL presser here: http://seekingalpha.com/pr/16696881-delta-alaska-airlines-will-end-partnership-may-2017