Define "need". It's faster, cheaper, and more convenient to drive to SeaTac and you get to do it on your own schedule. So many options too - light rail, Dungeness Line, Rocket. All vastly more affordable and you can pick the one that suits your schedule best. The airline sleft because they couldn't make it here and didn't have the business so why do they think they can make it with a lesser aircraft and have to have a handout?