United operates out of seven US-based and four international airport hubs. O’Hare International Airport in Chicago serves as their main base. The other 10 hubs are as follows: • Denver International Airport, US • Frankfurt International Airport, Germany • Antonio B. Won Pat International Airport, Guam • Houston/George Bush Intercontinental Airport, US • London Heathrow International Airport, UK • Los Angeles International Airport, US • Newark Liberty International Airport, US • San Francisco International Airport, US • Tokyo Narita Airport, Japan • Washington Dulles International Airport, US
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