Avianca S.A. (acronym in Spanish for "Aerovias del Continente Americano S.A.", "Airways of the American Continent") is a Colombian airline. It has been the 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 the flagship of a group of eight Latin American airlines, whose operations are combined to function as one airline using a codesharing system. Avianca is the largest airline in Colombia and second largest in Latin America, after LATAM of Chile. Avianca and its subsidiaries have the most extensive network of destinations in Latin America. Prior to the merger with TACA in 2010, it was wholly owned by Synergy Group S.A., a South American holding company established by Germán Efromovich and specialising in air transport. It is listed on the Colombia Stock Exchange.