Airport Code: ATL
Hartsfield-Jackson Airport services the bustling Southern city of Atlanta and is the primary airport for visitors to the Southeast U.S. Many southern regional airlines operate out of Hartsfield-Jackson and Delta Airlines has its hub here. ATL has 151 domestic and 28 international gates.
Airport Code: ORD
O'Hare was the busiest airport in the United States for year until Atlanta's Hartsfield-Jackson took that title away in the late 1990s. O'Hare is a major connecting airport for destinations in the Midwest and is a hub for United Airlines
Airport Code: LAX
Los Angeles International has a new international terminal [video] to help handle the influx of visitors from Asia and the Pacific. Besides being the main airport for travelers to Los Angeles, Hollywood, and Southern California, LAX handles many connections to Hawaii and the destinations on the West Coast.
Guide to Los Angeles Airports, including LAX and airports in Burbank, Long Beach, Santa Ana, and Ontario.
Airport Code: DFW
Dallas/Fort Worth International Airport is the busiest airport in the state of Texas. Because of the airport's size, the airport has its own postal code and post office. DFW has also been named one of the nation's most tech-friendly airports. American Airlines has a hub at DFW.
Airport Code: DEN
Denver International Airport is the largest airport by area in the United States. Many regional carriers, particularly Frontier Airlines and Southwest Airlines, connect to DEN. Travelers visiting the western states of Colorado, Wyoming, Utah, Idaho, Montana, and New Mexico will likely travel via Denver.
Airport Code: JFK
The main international airport for New York City, JFK sees arrivals and departures from almost every international airline in the world. While a number of domestic flights are handled at JFK, the nearby LaGuardia Airport (near the end of this list) is NYC's main domestic airport. American Airlines and Delta Airlines have a large number of connections through JFK, as does the popular, low-cost airline JetBlue Airways.
Airport Code: SFO
With three domestic terminals and one international terminal, San Francisco International Airport is the second largest airport in California and serves as a hub for west coast travelers to and from Europe and Asia. The hip airline Virgin America has its base of operations at SFO and United has a large hub here. In the late 2000s, SFO's central Terminal 2 underwent extensive renovations to make it a more "green" airport. It reopened in 2011 and is now considered one of the more stylish and passenger-friendly terminals in the U.S.
Airport Code: LAS
Although the glitz of Las Vegas is minutes away, travelers need not leave the McCarran International Airport to gamble, as there are more than 1,000 slot machines available to avid gamblers right inside the terminals. Airlines that serve LAS include low-cost carriers like Southwest and Spirit, as well as United, American, and Delta.
Airport Code: PHX
Airport Code: IAH
United Airlines' largest hub is at George Bush Intercontinental Airport, but it is far from the only carrier that services this busy Texan airport. The busiest routes to and from IAH include points in Central and South America.