Continental Airlines (CO) was a major United States airline headquartered in Houston, Texas. Prior to its merger with UAL Corporation, Continental Airlines operated flights to more than 125 domestic and 130 international destinations across the Americas, Asia-Pacific and Europe. In May 2010, Continental Airlines announced its merger with UAL through stock swap. In July 2010, the merger got the approval from the European Union. By October 2010, the acquisition had taken place and the holding company was renamed to United Continental Holdings. The period of integration took more than two years during which both the airlines handled separate operations. On Mar 3, 2012, the integration was completed and Continental Airlines ceased its operations.