Alaska Air Group Inc operates two airlines, Alaska and Horizon in three operating segments. The Mainline segment includes scheduled air transportation on Alaska's Boeing and Airbus jet aircraft for passengers and cargo throughout the U.S.,and in parts of Mexico, and Costa Rica. The Regional segment includes Horizon's and other third-party carriers' scheduled air transportation for passengers across a shorter distance network within the U.S. and Canada under capacity purchase agreements (CPA). The Horizon segment includes the capacity sold to Alaska under a CPA. It earns revenues from Passenger tickets, including ticket breakage and net of taxes and fees, Passenger ancillary and Mileage Plan passenger revenue.