Hartsfield–Jackson Atlanta International Airport , also known as Atlanta Airport, Hartsfield Airport, and Hartsfield–Jackson, is a public airport in Atlanta, Georgia. It is the world's busiest airport by number of passengers and number of landings and take-offs since 2005. It serves 89 million passengers per year. The airport is the main hub of AirTran Airways, Delta Air Lines, and ExpressJet. The Delta hub is the world's largest airline hub. Delta Air Lines flew most (59%) of passengers from the airport in February 2011. The airport has 199 gates. It has both domestic and international gates.