Alaska Airlines is a major American airline headquartered in SeaTac, Washington, within the Seattle metropolitan area. It is the fifth-largest airline in North America when measured by scheduled passengers carried. Alaska, together with its regional partners Horizon Air and SkyWest Airlines operates a route network primarily focused on connecting cities along the West Coast of the United States to over 100 destinations in the contiguous United States, Bahamas, Belize, Canada, Costa Rica, Guatemala and Mexico.

The airline operates out of five hubs. Its primary hub is Seattle–Tacoma International Airport. Alaska Airlines is a member of Oneworld, the third-largest airline alliance in the world. As of 2020, the airline employs over 16,000 people and has been ranked by J. D. Power and Associates as having the highest customer satisfaction of the traditional airlines for twelve consecutive years. In December 2023, Alaska Airlines announced plans to buy Hawaiian Airlines in a $1.9 billion deal.