United Air Lines Inc., is a major airline based in the United States and one of the world's largest airlines with 86,852 employees and 356 aircraft. It is a subsidiary of United Continental Holdings, Inc. formerly, UAL Corporation, with corporate headquarters in Chicago. United's largest hub is Chicago's O'Hare International Airport. United also has hubs in Washington Dulles International Airport, Denver International Airport, San Francisco International Airport, Los Angeles International Airport, and Narita International Airport near Tokyo.
Presented by the Guam Visitors Bureau, Pacific Islands Club Guam and United Airlines, the Guam International Marathon is a destination marathon featuring a scenic course that follows Guam's beautiful western ocean front.