Question: Which city are the headquarters of this airline founded in 1946 and privatized in 1969, which operates joint ventures with Delta Air Lines, located? 
Sentence (from "Delta Air Lines"): 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.
Relevant evidence: Yes