Hi -
I thought I would bump this up. I was looking at August and noticed that they now have 4 mainline flights:
PDX - SEA ---------------------------------- SEA - PDX
#423 - 0700-0744 ----------------------- #412 - 0630-0723
#411 - 0915-1008 ----------------------- #422 - 1715-1803
#403 - 1915-2005 ----------------------- #420 - 2100-2148
#421 - 2245-2333 ----------------------- #414 - 2230-2318
Nice to have!