The airline based in Antananarivo, Madagascar formed an airline alliance in what year?
Vanilla Alliance: The Vanilla Alliance (French: "Alliance Vanille" ) is an airline alliance formed in September 2015 to improve air connectivity within the Indian Ocean region by strengthening cooperation between the airlines of Indian Ocean Commission members. Air Madagascar: Société Nationale Malgache de Transports Aériens, Société Anonyme, operating as Air Madagascar, is an airline based in Antananarivo, Madagascar.
i don't know