Question: When was the airline alliance founded whose one of the member among 20 member carriers is Korean Air?
Sentence (from "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.
Relevant evidence: Yes