Great news for Alaska Airlines Mileage Plan members heading to Seattle: The airline announced a sale for award redemption's between Seattle and San Francisco, Los Angeles and Long Beach. Instead of the regular 25,000 miles required for a free round-trip ticket, you pay only 15,000 miles. Discounts are available for one-way and first class travel also.The offer is valid for flights between January 6, 2009 and March 19, 2009.