I would never put Alaska and America West in the same category. Alaska is more full service complete with meal service and America West is a LCC that has no meal service except for select first class flights Now Alaska does not offer any IFE, and America West has it, go figure. Now when you mention a medium class, I think of Midwest / YX
they plane have no middle seats, all leather, no IFE tho, and they use to offer better than the majors meals. Well they barely avoided a bankruptcy filing and now offer less meal service, and has introduced a LCC with in an airline concept as well. So my guess would be no market for a medium fare carrier.