Horizon Air is a regional airline in the United States headquartered in SeaTac, Washington, within the Seattle metropolitan area. It is a wholly-owned subsidiary of the Alaska Air Group and it is paid by fellow group member Alaska Airlines to staff, operate and maintain aircraft used on flights that are scheduled, marketed and sold by Alaska Airlines. Planes operated by Horizon are co-branded as Alaska HORIZON in order to differentiate Horizon's planes from those operated by Alaska's other regional airline partner, SkyWest Airlines.

Portland International Airport is a joint civil–military airport and the largest airport in the U.S. state of Oregon, accounting for 90% of the state's passenger air travel and more than 95% of its air cargo. It is within Portland's city limits just south of the Columbia River in Multnomah County, 6 miles by air and 12 mi (19 km) by highway northeast of downtown Portland. Portland International Airport is often referred to by its IATA airport code, PDX. The airport covers 3,000 acres of land.