San Francisco International Airport is the largest airport in the San Francisco Bay Area. As of 2005, San Francisco International Airport is the thirteenth largest in U.S. and the twenty-second largest airport in the world, in terms of passengers. It is a major hub of United Airlines, and is expected to become the main hub of Virgin America when the airline begins operations in 2006. Convenient parking is available at San Francisco International Airport 24 hours a day, 365 days a year. Hourly and daily parking is provided in the Domestic and International Garages. San Francisco International Airport has numerous passenger amenities, including a wide range of food and drink establishments, shopping, baggage storage, public showers, a medical clinic, and assistance for lost or stranded travelers and military personnel. The airport hosts the Louis A. Turpen Aviation Museum, the San Francisco Airport Commission Aviation Library, and both permanent and temporary art exhibitions in several places in the terminals. Public Wi-Fi is available throughout most of the terminal area, provided by T-Mobile for a fee.