United Air Lines, Inc. (United) is wholly owned by UAL Corporation (UAL), which is a holding company. The Company operates its businesses through two reporting segments: Mainline and United Express. United Airlines operates nearly 3,000 flights a day on United and United Express to more than 200 United States domestic and international destinations. United transports people and cargo through its mainline operations, which utilize full-sized jet aircraft exceeding 70 seats in size, and its regional operations, which utilize smaller aircraft not exceeding 70 seats in size that are operated under contract by United Express carriers. The Company also generates revenue through its Mileage Plus Frequent Flyer Program (Mileage Plus), United Cargo and United Services.