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:
Anchorage Glacier Bay
Anchorage Puerto Vallarta
Boise Los Angeles
Las Vegas Santa Rosa/Sonoma County
Seattle Orange County