Through Nov. 15, 2010, Delta SkyMiles members can earn double miles on all flights that include travel on Alaska Airlines/Horizon Air and Delta, Air France, KLM or Alitalia. For example, you can travel on Delta Air Lines from Atlanta to Los Angeles and continue on to Seattle on Alaska Airlines. From the West Coast, you could fly from Portland to Los Angeles on Alaska Airlines and continue travel to Rome on Alitalia. Registration is required at http://www.delta.com/alaskaoffer – The bonus offer only applies to Delta SkyMiles.