Ah, you are forgetting the Pacific Northwest corridor. There are flights on the .5 hour SEA-PDX, and SEA-YVR. Also, the SEA-SFO (or bay area) is VERY busy, with AS, AA, UA, and SW flying to SFO, OAK, and SJC. These flights depart on the hour for United alone! Once AA took over Reno Air's routes to SJC, there are a lot more AA MD-80s at SEA!