Horizon Airlines is a regional airline based in the United States. It is a subsidiary of Alaska Airlines and operates flights primarily within the western states of the country. Established in 1981, Horizon Airlines is headquartered in Seattle, Washington. The airline operates a fleet of Embraer E175, Bombardier Q400, and Embraer E175-E1 aircraft, offering service to various destinations in Washington, Oregon, Idaho, California, Nevada, Montana, and British Columbia, Canada. Horizon Airlines provides both scheduled passenger flights and also operates as a feeder airline for Alaska Airlines, offering connecting flights for passengers to other destinations.