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Alaska Air Group, Inc. is the holding company of Alaska Airlines (Alaska), Virgin America Inc., Horizon Air (Horizon) and other business units. The Company operates through three segments: Mainline, Regional and Horizon. Its Mainline segment includes Alaska's and Virgin America's scheduled air transportation for passengers and cargo throughout the United States, and in parts of Canada, Mexico, Costa Rica and Cuba. Its Regional segment includes Horizon's and other third-party carriers' scheduled air transportation for passengers across a shorter distance network within the United States under capacity purchased arrangements (CPAs). Its Horizon segment includes the capacity sold to Alaska under CPA. Alaska and Virgin America operate fleets of narrowbody passenger jets. As of December 31, 2016, it maintained two frequent flyer plans: the Alaska Airlines Mileage Plan and the Virgin America Elevate.