Orbitz Worldwide, Inc. is a company that operates a web site used to research, plan and book travel.[3] It is headquartered in the Citigroup Center in Near West Side, Chicago, Illinois, United States.[4] Orbitz Worldwide is a publicly traded company listed on the New York Stock Exchange following its initial public offering (IPO) in July 2007. Orbitz Worldwide’s largest investor is Travelport.