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? 

Context articles: Korean Air
DAL Global Services
Delta Air Lines
Chicago and Southern Air Lines
Delta TechOps
United Airlines
Delta Air Lines fleet
Business Express Airlines
SkyMiles
Endeavor 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.
DAL Global Services, LLC (DGS), a Delta Air Lines company, is an aviation services provider.
 DGS provides services such as aircraft ground handling, aircraft maintenance, cargo handling, and many other aviation-related services.
 DGS services over 50 airports within the USA and the Bahamas.
 They have contracts with multiple airlines and have not limited themselves to Delta Air Lines.
 DGS has over 7,000 employees.
 It is headquartered at the Delta Air Lines headquarters in Atlanta.
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.
Chicago and Southern Air Lines (C&S) was a United States airline that started life as Pacific Seaboard Air Lines in California and was organized on June 15, 1933.
 Following the move from California, the airline's headquarters were initially located in St. Louis, Missouri and were then moved to Memphis, Tennessee which also served as a hub for the carrier.
 C&S was merged into Delta Air Lines in 1953 thus providing Delta with its first international routes.
Delta TechOps is the maintenance, repair and overhaul (MRO) division of Delta Air Lines, and is headquartered at Hartsfield-Jackson International Airport (ATL) in Atlanta, Georgia.
 With more than 9,600 Technical Operations employees and 51 maintenance stations worldwide, Delta TechOps is a full-service maintenance provider for the more than 750 aircraft that make up the Delta Air Lines fleet.
 In addition to maintaining the Delta Air Lines fleet, Delta TechOps also provides MRO solutions and support to more than 150 third-party operators around the world, making it the largest airline MRO provider in North America and the third largest worldwide.
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.
As of September 2017, the Delta Air Lines mainline fleet comprises 852 aircraft in service, making it one of the largest airline fleets in the world.
 Before merging with Northwest Airlines in 2009, Delta Air Lines operated an all-Boeing and McDonnell Douglas fleet; it incorporated Northwest's Airbus aircraft into its fleet following the merger and subsequently ordered further Airbus types.
 Delta is known for its policy of generally buying older generation or used aircraft and for continuing to fly aircraft for 20–30 years, much longer than most other major airlines.
 As such, it has one of the oldest fleets of any American airline, with an average fleet age of 17 years as of 2017.
 Fellow U.S. legacy carriers American Airlines and United Airlines have much younger fleets; as of December 29, 2016, American had an average fleet age of 10.3 years, while United had an average fleet age of 14.1 years.
Business Express Airlines (IATA: HQ) , often referred to as Business Express or BizEX, was an American regional airline founded as Atlantic Air in 1982.
 In an effort to appeal to its predominantly business commuter clientele, the airline assumed the Business Express name in 1985.
 In 1986 Pilgrim Airlines (Groton/New London), which itself had acquired NewAir (New Haven) about a year prior, was acquired by the airline.
 This opened the valuable New York and Washington, D.C. markets.
 Shortly thereafter, Business Express became one of Delta Air Lines's first Delta Connection carriers, along with Atlantic Southeast Airlines, Comair and SkyWest Airlines.
SkyMiles is the frequent-flyer program of Delta Air Lines that offers points (or "miles") to passengers traveling on most fare types, as well as to consumers who utilize Delta co-branded credit cards, which accumulate towards free awards such as airline tickets, business and first class upgrades, and luxury products.
 Created in 1981 as the "Delta Air Lines Frequent Flyer Program"; its name was changed to SkyMiles in 1995.
 Delta claims that it is the only major U.S. airline without mileage expiration, so travelers can redeem awards at their leisure.
 The airline also has a separate SkyBonus program that provides small to mid-sized business owners with a way to earn points for trips taken by employees, good towards free flights, upgrades, Silver Medallion status and other travel awards.
Endeavor Air is an American regional airline that operates as Delta Connection for Delta Air Lines.
 The airline was founded as Express Airlines I in 1985 and changed names to Pinnacle Airlines in 2002.
 In 2012, Pinnacle's parent company filed for chapter 11 reorganization, then emerged as a wholly owned subsidiary of Delta Air Lines.
 The name of the airline was changed to Endeavor Air on August 1, 2013.