Avianca S.A. (acronym in Spanish for "", Airways of the American Continent) is the national airline and flag carrier of Colombia, since 5 December 1919, when it was initially registered under the name SCADTA. It is headquartered in Bogotá, D.C. with its main hub at El Dorado International Airport. Avianca is also a trademark comprising a group of seven Latin American airlines, whose operations are combined to function as one airline using a code sharing system. Avianca is the largest airline in Colombia and second largest in Latin America. Avianca together with its subsidiaries has the most extensive network of destinations in Latin America. It is wholly owned by Synergy Group S.A., a South American holding company established by Germán Efromovich and specializing in air transport. It is listed on the Colombia Stock Exchange.