This morning, Alaska Airlines sent out an email announcing another Buy One Get One promotion for Economy Class flights on 2/29 and 3/3.
Details are below:

Discounted routes are indicated by a red marker when you use the promo code in the AlaskaAir search tool.

Discounted fares are eligible for the same Elite Qualifying Miles and Redeemable Miles as non discounted fares, so this is a great way to progress toward elite status with Alaska Airlines.
If you’re looking to do some last minute travel or planning your next mileage run, Buy One Get One fares are one of the best ways to do it. For details and a full list of eligible routes, check out the promotion page here.