George Bush Intercontinental Airport
Courtesy of Houston Airports
Location: Houston, Texas
Airport Code: IAH
One of United Airlines' largest hubs is George Bush Intercontinental Airport, but it is far from the only carrier that services this busy Texan airport. Alaska, American, and Delta airlines also service the airport. Routes between IAH and Central and South America tend to be the busiest.
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Charlotte Douglas International Airport
Photo courtesy of Charlotte-Douglas International Airport
Location: Charlotte, North Carolina
Airport Code: CLT
This airport in North Carolina connects a string of cities along the East Coast. For flight transfers, CLT is often a common alternative to Atlanta's Hartsfield International Airport. It is well known for the rows of rocking chairs that line the main hall and provide a relaxing way to spend a layover.