The Boeing B737 and its many variants is the mainstay of Alaska Airlines' fleet. Alaska Airlines has 12 of these B737-900s, each with a total of 172 seats in economy class and First.

Alaska Airlines has two different configurations of B737-900. While they have the exact same number of seats onboard, this one has an extra galley between the First and economy class cabins, while the other has an extra toilet and closet in the aft section.