Discount: Valid for one companion fare from $22 (USD) ($0 base fare plus taxes and fees from $22 depending on your Alaska Airlines or Virgin America flight itinerary) when traveling with another passenger on a paid fare, published at alaskaair.com. Valid for round-trip or one-way travel in the main cabin. Not valid on First Class fares. Multiple stopovers not allowed. Not applicable to Mileage Plan Award Reservations, Alaska Airlines Vacation Packages, tour or contract fares.
使用方法是我email给你code，买一张原价的阿拉斯加航空来回或单程经济舱机票，你在订票的页面的"Discount Code"里面贴上就可以了。
贴一个总结的很好的tips:
https://www.travelcodex.com/13-tips-and-tricks-alaska-airlines-companion-fare/
Discount: Valid for one companion fare from $22 (USD) ($0 base fare plus taxes and fees from $22 depending on your Alaska Airlines or Virgin America flight itinerary) when traveling with another passenger on a paid fare, published at alaskaair.com. Valid for round-trip or one-way travel in the main cabin. Not valid on First Class fares. Multiple stopovers not allowed. Not applicable to Mileage Plan Award Reservations, Alaska Airlines Vacation Packages, tour or contract fares.