Avianca S.A. (acronym in Spanish formerly for Aerovías Nacionales de Colombia S.A. (National Airways of Colombia), currently Aerovías del Continente Americano S.A. (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 the El Dorado International Airport. Avianca is also a trademark comprising a group of seven independently IATA-coded and -owned 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 one in Latin America: Avianca together with their subsidiaries has the most extensive network of destinations in Latin America and one of the largest and most modern aircraft fleets on the continent. It is wholly owned by the Synergy Group S.A., a Latin American holding company established by Germán Efromovich and specializing in air transport. it's listed on the Colombia Stock Exchange.