One of the challenges with Delta’s buildup in the Seattle market has been the city’s intense loyalty to their hometown airline. “Alaska Airlines” is a strange name for a carrier based in Seattle but Seattleites feel a strong affinity for the company.
Delta has done a lot to move the needle, beyond schedule and price. Like Alaska they offer a 20 minute baggage delivery guarantee. The Seattle airport Sky Club is one of their best. And there have been semi-frequent mileage offers targeted at the local market.