Question: The Colombian airline that has been the national airline and flag carrier of Colombia since 1919 is wholly owned by a company headquartered in what country?

The National Liberation Army (Spanish: Ejército de Liberación Nacional, ELN) is an armed group involved in the continuing Colombian armed conflict, which has existed in Colombia since 1964.  The ELN advocate a composite communist ideology of Marxism and liberation theology.  They conduct military operations throughout the national territory of Colombia; in 2013, it was estimated that the ELN forces consisted of between 1,380 and 3,000 guerrillas.  The ELN is the lesser known of two communist guerrilla armies who operate in Colombia; the other guerrilla army is the Revolutionary Armed Forces of Colombia (FARC–EP) who are Marxist–Leninist in their approach to the national liberation of Colombia.  According to former ELN national directorate member Felipe Torres, one fifth of ELN supporters have taken up arms.  The ELN has been classified as a terrorist organization by the governments of Colombia, Peru, United States, Canada and the European Union. <SEP>  It is headquartered in Bogotá, D.C. with its main hub at El Dorado International Airport.  Avianca also comprises 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 S.A. (acronym in Spanish for "Aerovías del Continente Americano S.A. "), Airways of the American Continent, is a Colombian airline that has been the national airline and flag carrier of Colombia since 5 December 1919, when it was initially registered under the name SCADTA.  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. <SEP> Synergy Group Corp. is a South American conglomerate created and owned by Germán Efromovich, an entrepreneur holding multiple citizenship of Brazil, Colombia and Poland.  It operates several airlines in South America, among which are Avianca Holdings, with a 66.66% stake, and is active in the exploration of oil and natural gas throughout the region.  Additionally, it operates hydroelectric power plants, participates in the construction of telecommunications infrastructure, shipbuilding and technical inspections, radiochemistry, radiopharmaceuticals, agriculture and hospitality.  The group is headquartered in Rio de Janeiro, Brazil. <SEP> Air Tanzania Company Limited (ATCL) (Swahili: "Kampuni ya Ndege Tanzania" ) is the flag carrier airline of Tanzania based in Dar es Salaam with its hub at Julius Nyerere International Airport.  It was established as Air Tanzania Corporation (ATC) in 1977 after the dissolution of East African Airways and has been a member of the African Airlines Association since its inception.  The airline was wholly owned by the Tanzanian Government until 2002 when it was partially privatised as per the directive of the Bretton Woods Institutions to implement the country's Structural Adjustment Program.  The government therefore reduced its shareholding to 51 percent and entered into a partnership with South African Airways.