I like AS a lot, but will consider other airlines depending on the routes. DL (operated by OO) has a good product on its seasonal SEA-PSP flights and with 2-2 seating, one can even fly basic economy and be guaranteed a window or aisle seat. The flight times are often better than AS as well. SEA-LAX/SFO has free alcohol on DL, which is a plus for many passengers as well.
When one's not trying for status, it makes it easier to try different airlines and see what they have to offer.
Out of SEA, AS still has a lot of bulk (unpublished) airfares, which makes last minute leisure travel affordable. I recently learned that DL is doing this as well, but on a more limited basis.