I am on DL award this summer and after I booked it (one of the flights being the SEA-JNU milkrun), I noticed that the seat selections were much better from SEA-PSG than all the way to JNU. Alaska reservations said they couldn't do split seat assignments but to check at the gate (yeah right, when everything is already gone) so I called Delta and asked if they could split the trip into a SEA-PSG segment and then a PSG-JNU segment. After some time, effort, and patience on their part, they were able to split the trip which allowed me to get better seats on the SEA-PSG portion. The odd thing about it is that seat assignment changes now need to be done over the phone because alaska-air.com, while showing the two segments and separate seat assignments, still shows SEA-JNU when you try to pull up the seat map and change seats...you end up getting red error messages no matter what kind of seat change you want to do...I think it must be too much for the computer...lol...oh well, I got what I wanted.