Going back to the earlier discussion about DAL and Alaskan cohabiting SEA, here is my point with this all being about Asia. Check out the A350 range out of SEA:



Now it's about the same out of LAX, but LAX is crowded with direct to asia flights with 388s/744s/733s. SFO too. SEA isn't. So you can run larger yet smaller and more efficient jets with better margins. IMHO the only thing DAL wants to do in SEA domestically is properly feed those A350s. If HVCs are coming out of Fargo for example then there will be a 739 doing SEA-FAR, if not, then they won't serve it unless they want to pack the place and make it hard for competitors to operate international flights and properly feed them.