Alaska Air Group operates two airlines, Alaska Airlines, Inc. (Alaska) and Horizon Air Industries, Inc. (Horizon). Co. also includes McGee Air Services, an aviation services provider. Co. has three operating segments: Mainline, which 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, Costa Rica and Belize; Regional, which 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); and Horizon, which includes the capacity sold to Alaska under a CPA.