Question: The airline based in Antananarivo, Madagascar formed an airline alliance in what year?

Context paragraphs:
History of Kingfisher Airlines: Kingfisher Airlines was established in 2003.  It is owned by the Bengaluru based United Breweries Group.  The airline started commercial operations on 9 May 2005 with a fleet of four new Airbus A320-200s operating a flight from Mumbai to Delhi.  It started its international operations on 3 September 2008 by connecting Bengaluru with London.  Kingfisher's head office is located in Kingfisher House Western Express Highway Vile Parle (E) Mumbai – 400099 India and its registered office is located in UB City, Bangalore.  Its head office was previously in the Kingfisher House in Vile Parle (East), Mumbai.  In 2012 Vijay Mallya was trying to sell the Vile Parle Kingfisher House.  The airline had shut down its operations when on 20 October 2012 the DGCA suspended its flying license.  This suspension had been due to failure to give an effective response to the show-cause notice issued by DGCA.  However, The airline had locked out its employees for several days before this suspension.  On 25 October 2012, the employees agreed to return to work.  On 7 June 2010 Kingfisher became a member elect of the Oneworld airline alliance when it signed a formal membership agreement.  Kingfisher confirmed on 20 December 2011 that it will join the Oneworld airline alliance on 10 February 2012.  Kingfisher would have been the first Indian carrier to join one of the big airline alliances.  However, on 3 February 2012, owing to bad financial situation and two days after the International Air Transport Association (IATA) clearing house suspended Kingfisher Airlines; the airlines participation to Oneworld has been put on hold.

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.  Ultimately, the alliance wishes to increase tourism, trade, and business ties in the region.  The founding members are Air Austral, Air Madagascar, Air Mauritius, Air Seychelles and Int'Air Îles.

Tiko Air: Tiko Air is an airline based in Antananarivo, Madagascar.  It operates charter services within Madagascar.

AirClub: The AirClub is a 2012 founded airline alliance of seven airlines.  It is considered to be the first and only airline alliance of business airlines, in the world.  The alliance has a fleet of over 100 aircraft and is headquartered in Geneva, Switzerland.

USCA Foot: USCA Foot ("Union Sportive de la Commune Urbaine d'Antananarivo") is a football club based in Antananarivo, Madagascar.  They won the THB Champions League and the Coupe de Madagascar in 2005 and were runners-up in the Coupe in 2004 and 2006.  It also competed in the CAF Champions League 2006 beating SS Excelsior of Réunion and Mamelodi Sundowns of South Africa, but failed to qualify for the group stage after losing to Ghanaians Asante Kotoko.

Oneworld: Oneworld (marketed as oneworld; CRS: *O) is an airline alliance founded on 1 February 1999.  The alliance's stated objective is to be the first-choice airline alliance for the world's frequent international travelers.  Its central alliance office is currently based in New York City in the United States.  Its member airlines include Air Berlin, American Airlines, British Airways, Cathay Pacific, Finnair, Iberia, Japan Airlines, LATAM Airlines, Malaysia Airlines, Qantas, Qatar Airways, Royal Jordanian, S7 Airlines and SriLankan Airlines, plus some 21 affiliated airlines.  As of August 2016, Oneworld is the third largest global alliance in terms of passengers with more than 557.4 million passengers carried, behind Star Alliance (689.98 M) and SkyTeam (665.4 M).  Its slogan is "An alliance of the world's leading airlines working as one."

Madagascar Institute of Political Studies: Madagascar Institute of Political Studies (French: "Institut d’Etudes Politiques de Madagascar" ) is a department of the Reformed University of Madagascar (Université Reformée de Madagascar).  It is based in Antananarivo, Madagascar.  The university was opened in 2010.  The president is Davida Rajaon.

Andrianary Ratianarivo: Andrianary Ratianarivo (1895-1949) was a pianist and composer of "kalon'ny fahiny," "vakondrazana" and "ba-gasy" music from the central highlands of Madagascar.  He was a major composer for the Malagasy theatrical genre that reached its peak between 1920 and 1940 at the Theatre d'Isotry in Antananarivo.  Ratianarivo was born in the year of Madagascar's colonization to a musician of the royal palace.  His pieces were typically written for piano, often with solo, duet or choral vocal accompaniment sung in the Malagasy language.  He was classically trained as a conductor and composed over 500 songs and scores for theater, including an opera penned by Jean-Joseph Rabearivelo entitled "Imaitsoanala" (1935), which remains the only Malagasy opera.  In 1929 he formed "Troupe Jeanette" in Antananarivo with musicians Rakaramanga and Jeanette; this group, with new artists, continues to perform at the Theatre d'Isotry to the present.  His songs form part of the canon of classical Malagasy piano music.  A street in downtown Antananarivo is named after him.

Continent pass: A continent pass (usually called something like Europe (air)pass, Pacific (air)pass or American (air)pass) is a product and service of an airline alliance.  For a relatively low price the traveler can travel freely using all intra-continental flights the airline alliance offers on that continent.  There are restrictions on the number of miles, flights or stops the traveler can make.  Travelers can benefit from the extensive networks airline alliances offer and can earn reward points for each mile they fly by participating in the alliance's frequent flyer program.

Air Madagascar: Société Nationale Malgache de Transports Aériens, Société Anonyme, operating as Air Madagascar, is an airline based in Antananarivo, Madagascar.  It is the national airline of Madagascar operating services to Europe, Asia and neighbouring African and Indian Ocean island destinations, from its main base, Ivato International Airport in Antananarivo.  It also operates an extensive domestic network.

Supporting paragraphs: Vanilla Alliance Air Madagascar
Answer: 2015