Originally Posted by
steadyASshegoes
Thanks. That does help. Strangely, it appears the AS fare quoted on alaskaair.com includes the excise tax, but the ITA matrix displays it separately.
IIRC, airlines are required to include the 7.5% excise tax when advertising airfares. The other taxes depend on the routing chosen by the passenger, which is one of the reasons why the total price is not usually advertised.