Another discount code courtesy of Airfarewatchdog.

Alaska Airlines/Horizon Air is offering a 10% discount on select flights to some of their smaller markets. Enter Discount Code EC4642 when booking your reservation through their website. Tickets must be booked by June 7, 2009. Travel between June 22, 2009 and July 31, 2009.

Sample routes include include:

Between:            And:
Anchorage          Glacier Bay
Anchorage          Puerto Vallarta
Boise                  Los Angeles
Eugene               Vancouver
Newark               Pullman
Las Vegas          Santa Rosa/Sonoma County
Phoenix              Victoria
Seattle                Orange County