Question: In what year did the state-owned competitor of Air 26 gain flag carrier staus?

Context paragraphs:
Air Nicaragua: Nicaragua Airways is the potential future national flag carrier of Nicaragua.  Its main base is Augusto C. Sandino International Airport, Managua.  It is the first time in 20 years that Nicaragua will have a national flag carrier, after Aeronica ceased operations in 1991.  Since then, the flag carrier status was awarded to Nicaragüense de Aviación also known as NICA Airlines.  Several airlines had tried to become the Nicaraguan flag carrier like CAAL (Central American Airlines), SANSA (Servicios Aereos Nicaraguenses S.A.) but none of these survived a year.  Today even NICA Airlines (6Y) is registered as the national airline of Nicaragua, the only international flight it operated once (Managua to Miami) and is done under the TACA code (TA) as a full TACA Airlines flight.

Air 26: Air26 - Linhas Aéreas, S.A. is an airline based in Luanda, Angola.  Founded in 2006, it operates domestic passenger and cargo flights out of the city's Quatro de Fevereiro Airport.  Along with all other Angolan airlines except for TAAG, Air 26 is banned from operating within the European Union.  In 2010, the company had its licence revoked, but it was re-issued on 31 January 2011.

Air Botswana: Air Botswana Corporation is Botswana's state-owned national flag carrier, with its headquarters located in Gaborone.  It operates scheduled domestic and regional flights from its main base at Sir Seretse Khama International Airport.  Air Botswana has been loss-making for several years, and there have been various attempts to privatise the company, and frequent changes to the corporation's management and board, so far without reducing the losses.

TAAG Angola Airlines: TAAG Angola Airlines E.P. (Portuguese: "TAAG Linhas Aéreas de Angola E.P." ) is the state-owned national airline of Angola.  Based in Luanda, the airline operates an all-Boeing fleet on domestic services within Angola, medium-haul services in Africa and long-haul services to Brazil, Cuba, China and Portugal.  The airline was originally set up by the government as "DTADivisão dos Transportes Aéreos" in 1938, rechristened "TAAG Angola Airlines" in 1973, and gained flag carrier status in 1975.  It is now a member of both the International Air Transport Association and the African Airlines Association.

Nordica (airline): Nordica is the state-owned Estonian flag carrier headquartered in Tallinn and based at Lennart Meri Tallinn Airport.  It is the largest air carrier at Lennart Meri Tallinn Airport.  The airline was formed after the 2015 bankruptcy of the previous flag carrier Estonian Air.  Since most of the flights are marketed by LOT Polish Airlines, which owns 49% of the shares and a member of the Star Alliance, Nordica also carries LOT's flight codes and callsign on most of its flights.  Through its subsidiary Regional Jet in a partnership with Scandinavian Airlines, Regional Jet operates four ATR72-600s between Copenhagen, Aarhus, Aalborg, Billund, Goteborg, Hanover and other SK destinations.

Air Côte d'Ivoire: Air Côte d'Ivoire is the flag carrier of Ivory Coast, based in Abidjan.  The company succeeded the country's former flag carrier Air Ivoire, which went bankrupt in 2011.  It started operations on 12   2012 (2012--) .

Air Ukraine: Air Ukraine (Ukrainian: Авіалінії України "Avialiniyi Ukrayiny") was a state-owned airline from Ukraine, serving as flag carrier of the country from 1992 to 2002.  Headquartered in Kiev, Air Ukraine operated scheduled passenger and cargo flights mostly on domestic routes or within the Commonwealth of Independent States, but also to other European cities and to North America.

Cameroon Airlines: Cameroon Airlines was an airline from Cameroon, serving as flag carrier of the country.  Based in Douala, it operated scheduled services within Africa, as well as to Europe and the Middle East out of its hub at Douala International Airport, with a second network focus on Yaoundé Nsimalen International Airport.  The company was 96.43 per cent state owned, with the remaining shares having been held by Air France.  It ceased operations in March 2008; its role as Cameroon's flag carrier was taken over by Camair-Co.

AirBaltic: airBaltic, legally incorporated as AS Air Baltic Corporation, is a state-owned Latvian low-cost carrier and the country's flag carrier, with its head office on the grounds of Riga International Airport in Mārupe municipality near Riga.  Its main hub is at Riga International Airport with further bases at Tallinn Airport and Vilnius Airport.

SriLankan Airlines: SriLankan Airlines (marketed as SriLankan) is the flag carrier of Sri Lanka.  It was launched in 1979 as Air Lanka, following the termination of operations of the original Sri Lankan flag carrier Air Ceylon.  Following its partial acquisition in 1998 by Emirates, it was re-branded and introduced the current livery.  After ending the Emirates partnership, it has continued using its re-branded name and logo.

Supporting paragraphs: Air 26 TAAG Angola Airlines
Answer: 1975