United Parcel Service Inc. (UPS) is a package delivery company founded in 1907. It is headquartered in Sandy Springs, Georgia. The company operates a multinational shipping and supply-chain management operation that befits its title as the largest courier company in the world by revenue. Company staff is easily identifiable by its dark brown attire that is a fixture on the streets of many of the financial capitals of the world. The company, which was once known as the American Messenger Company specializing in telegraphs, has since diversified its services, gone international, and is now a prominent Fortune 500 company. The UPS main international hub is located in Louisville, Kentucky, which is the fifth busiest airport in the world by cargo traffic.