Alaska Air Group, Inc. is the holding company of Alaska Airlines (Alaska) and Horizon Air (Horizon). The Company operates through three segments: Alaska Mainline, Alaska Regional and Horizon. Its Alaska Mainline segment operates the Boeing 737 part of Alaska's business. It offers north/south service within the western United States, Canada, Mexico and Costa Rica, as well as passenger and dedicated cargo services to and within the state of Alaska. It also provides long-haul east/west service to Hawaii and cities in the mid-continental and eastern United States from Seattle. Its regional operations consist of flights operated by Horizon, SkyWest Airlines, Inc. and Peninsula Airways, Inc. The regional fleet operated by SkyWest consists of over eight CRJ 700 aircraft and approximately five E175 aircraft. Its Horizon segment operates regional aircraft. Horizon operates a fleet of turboprop aircraft. Horizon's operating fleet consists of approximately 50 Bombardier Q400 turboprop aircraft.