Question: When was the airline alliance founded whose one of the member among 20 member carriers is Korean Air?

Context paragraphs:
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.

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.

Value Alliance: Value Alliance is an airline alliance formed in May 2016.  It is the world's second alliance (after the U-FLY Alliance) to consist only of low-cost carriers (LCCs).  However, it is the first pan-regional LCC alliance.  It comprises seven Asia-Pacific airlines: Cebu Pacific, Jeju Air, Nok Air, NokScoot, Scoot, Tigerair Australia and Vanilla Air, along with Tigerair who merged with Scoot under the Scoot brand.

United Airlines: United Airlines, Inc., commonly referred to as United, is a major U.S. airline headquartered in Chicago, Illinois.  It is the world's third-largest airline when measured by revenue, after American Airlines and Delta Air Lines.  United operates a large domestic and international route network, with an extensive presence in the Asia-Pacific region.  United is a founding member of Star Alliance, the world's largest airline alliance.  Regional service is operated by independent carriers under the brand name United Express.  Its main competitors are American Airlines, Delta Air Lines, and Southwest Airlines.

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."

SkyTeam: SkyTeam is an airline alliance.  Founded in June 2000, SkyTeam was the last of the three major airline alliances to be formed, the first two being Star Alliance and Oneworld.  s of 2014 , SkyTeam consists of 20 carriers from five continents and operates with the slogan "Caring more about you".  It also operates a cargo alliance named SkyTeam Cargo, which partners ten carriers, all of them SkyTeam members.  Its centralised management team, "SkyTeam Central", is based at the World Trade Center Schiphol Airport on the grounds of Amsterdam Airport Schiphol in Haarlemmermeer, Netherlands.

Cho Yang-ho: Cho Yangho (Korean: 조양호, Hanja: 趙亮鎬, RR: "Jo Yang-ho", M-R: "Cho Yangho"; sometimes written Y. H. Cho) is the chairman and chief executive officer of Korean Air, chairman of the Hanjin Group, and a founding member of SkyTeam alliance.

Delta Air Lines: Delta Air Lines, Inc. ("Delta"; ) is a major American airline, with its headquarters and largest hub at Hartsfield–Jackson Atlanta International Airport in Atlanta, Georgia.  The airline along with its subsidiaries and regional affiliates operate over 5,400 flights daily and serve an extensive domestic and international network that includes 319 destinations in 54 countries on six continents, as of October 2016.  Delta is one of the four founding members of the SkyTeam airline alliance, and operates joint ventures with Air France-KLM, Alitalia, Korean Air, China Eastern Airlines, Virgin Atlantic, and Virgin Australia.  Regional service is operated under the brand name Delta Connection.

Wings Alliance: Wings (for clarity the Wings Alliance) was the working name of a proposed airline alliance to be anchored by the American carriers Northwest Airlines and Continental Airlines of USA with the European flag carriers KLM of the Netherlands and Italy's Alitalia.  Although these airlines cooperated with one another through code-sharing and frequent flyer program coordination, no formal association was ever announced.  It was rendered superfluous in September 2004 when most of its participants joined the SkyTeam alliance.

Korean Air: Korean Air Lines Co., Ltd. () (), operating as Korean Air, is the largest airline and flag carrier of South Korea based on fleet size, international destinations and international flights.  The airline's global headquarters are located in Seoul, Republic of Korea.  Korean Air was founded as Korean National Airlines in 1946.  After several years of service and expansion, the airline was fully privatized in 1969.

Supporting paragraphs: Cho Yang-ho SkyTeam
Answer: June 2000