DELTA Airlines has revised their codeshare operation with Alaska Airlines. DELTA has removed its “DL” code on some AS operating routes starting 6/5/14:

SEA - LAS
SEA - LAX
SEA - SAN
SEA - SFO
SEA - SJC
SEA - YVR

7/1/14

SEA - ANC
SEA - IAH

12/20/14

SEA - PHX