Kev,
people are ALWAYS loyal to their hometown brand, regardless of who it is, if they are a least bit decent in quality.
But DL is clearly doing the right thing or they couldn't be adding as much capacity as they have and have it as well received.
Clearly, PNW passengers are not as loyal as some would like to believe.
and, btw, you do realize that the SEA market, just like every other has two ends, only one of which is at SEA?
and DL along with every other airline that serves SEA has stronger sales OUTSIDE Of the PNW than AS does.
In fact in a market like LAX-SEA, DL gets almost identically half and half of its revenue from SEA and LAX origins. AS is 60% + SEA originating.
the same is true in MOST markets. obviously the seasonality favors AS in the winter when SEA passengers leave the PNW but favor DL and other carriers in the summer when PNW is the DESTINATION for people from other parts of the country. From DL hubs, the difference in DL's average fares and the size of the DL market vs. the size of the AS market is decidedly in DL's favor. Even in non-DL hub markets, though, DL has a strong showing in selling both from the PNW and in other parts of the country.
and the same phenomenon exists with JetBlue which gets a disproportionate share of its bookings in NYC but it does poorly in other parts of the country.
That is part of the reason why DL has done so well in NYC because DL has built its brand in NYC as a global carrier with a strong local presence but also does far better in selling on the other end of the NYC routes.. something B6 does not do well.
and to extend the concept one step further, UA is much stronger from its hubs than in the other direction... CO was the most directional of the big US carriers; UA had that some in its own network per-merger but it is more pronounced now. AA and DL have a much more balanced network with demand on both ends of their routes.
btw, Alaska is a SEATTLE based airline. The Eskimo is a great marketing tool to identify with the 49th state but it also is a hindrance in helping AS achieve brand identity outside of the PNW where people know that AS is really a Seattle based airline.
finally, DL has beat AS in DOT performance statistics in various recent months and tied them in a quality report that the Dallas Morning News featured. (you read the blog so you should be able to find it).
the notion that DL doesn't have the service quality to compete with AS is simply not accurate, esp. since DL is matching AS performance and also offers a broader array of passenger amenities including IFE than AS does.