Context: Northwest Airlink was the trade name of Northwest Airlines' regional airline service, which flew turboprop and regional jet aircraft from Northwest's domestic hubs in Minneapolis, Detroit, and Memphis. Service was primarily to small-to-medium-sized cities and towns where larger aircraft might not be economical to operate and also to larger markets to either provide additional capacity or more frequent flights than could be justified using mainline aircraft. Beginning in July 2009, the Northwest Airlink trade name was phased out, and replaced by the Delta Connection trade name for Delta Air Lines as part of the Delta/Northwest merger., KLM Royal Dutch Airlines, legally "Koninklijke Luchtvaart Maatschappij N.V.", is the flag carrier airline of the Netherlands. KLM is headquartered in Amstelveen, with its hub at nearby Amsterdam Airport Schiphol. It is part of the Air FranceKLM group, and is a member of the SkyTeam airline alliance. KLM was founded in 1919; it is the oldest airline in the world still operating under its original name and had 32,505 employees . KLM operates scheduled passenger and cargo services to approximately 130 destinations. , Air France (formally "Société Air France, S.A."), stylized as AIRFRANCE, is the French flag carrier headquartered in Tremblay-en-France, (north of Paris). It is a subsidiary of the Air FranceKLM Group and a founding member of the SkyTeam global airline alliance. As of 2013 Air France serves 36 destinations in France and operates worldwide scheduled passenger and cargo services to 168 destinations in 93 countries (including overseas departments and territories of France) and also carried 46,803,000 passengers in 2015. The airline's global hub is at Charles de Gaulle Airport with Orly Airport. Air France's corporate headquarters, previously in Montparnasse, Paris, are located on the grounds of Charles de Gaulle Airport, north of Paris., US Airways (formerly known as USAir) was a major American airline that ceased to operate independently when the Federal Aviation Administration granted a single operating certificate (SOC) for US Airways and American Airlines on April 8, 2015. Publicly, the two carriers appeared to merge when their reservations systems and booking processes were merged on October 17, 2015; however, other systems were still separate at that time. The airline had an extensive international and domestic network, with 193 destinations in 24 countries in North America, South America, Europe and the Middle East. The airline was a member of the Star Alliance, before becoming an affiliate member of Oneworld in March 2014. US Airways utilized a fleet of 343 mainline jet aircraft, as well as 278 regional jet and turbo-prop aircraft operated by contract and subsidiary airlines under the name US Airways Express via code sharing agreements. , Freedom Airlines , Inc. was an American FAA Part 121 certificated air carrier operating under air carrier certificate number FDKA087K issued on April 1 , 2002 . The Nevada Corporation was headquartered in Irving , Texas and a subsidiary of Mesa Air Group . It operated flights as Delta Connection for Delta Air Lines serving Delta 's hub at Cincinnati / Northern Kentucky International Airport in Hebron , KY , near Cincinnati , OH using EMB 145 aircraft . Freedom 's base moved to Cincinnati from New York City in July 2009 . Freedom previously operated the CRJ - 900 aircraft for Delta Connection as well , however , this contract was canceled and all aircraft were transferred to Eagan , MN - based Mesaba Airlines , Atlanta , GA - based Atlantic Southeast Airlines , and Pinnacle Airlines . A commuter airline flying as Freedom Airlines operated independent passenger service during the 1980s with Convair 580 and Fairchild Swearingen Metroliner turboprops . This earlier version of Freedom Airlines served the eastern U.S. including destinations in Massachusetts , Michigan , Ohio , Pennsylvania , South Carolina and Virginia including Washington D.C., Northwest Airlines Corp. (often abbreviated as NWA) was a major United States airline founded in 1926 and absorbed into Delta Air Lines, Inc. by a merger. Approved on October 29, 2008, the merger made Delta the largest airline in the world until the American Airlines-US Airways merger on December 9, 2013. Northwest continued to operate under its own name and brand until the integration of the carriers was completed on January 31, 2010., 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. In terms of the number of passengers and the number of members, SkyTeam has grown and is now the second largest alliance in the world, second only to Star Alliance and ahead of Oneworld. , 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., Virgin Atlantic, a trade name of Virgin Atlantic Airways Limited, is a British airline with its head office in Crawley, United Kingdom. The airline was established in 1984 as British Atlantic Airways, and was originally planned by its co-founders Randolph Fields and Alan Hellary to fly between London and the Falkland Islands. Soon after changing the name to Virgin Atlantic Airways, Fields sold his shares in the company after disagreements with Sir Richard Branson over the management of the company. The maiden flight from London Gatwick to Newark Liberty International Airport took place on 22 June 1984. The airline along with Virgin Holidays is controlled by a holding company, Virgin Atlantic Limited, which is 51% owned by the Virgin Group and 49% by Delta Air Lines. It is administratively separate from other Virgin-branded airlines., Mesaba Aviation, Inc. (operating as Mesaba Airlines) was an American regional airline based in Eagan, Minnesota The airline was a wholly owned subsidiary of Pinnacle Airlines Corporation. Its flights operated as Delta Connection for Delta Air Lines and US Airways Express for US Airways. Previously, the airline operated as Northwest Airlink and Northwest Jetlink on behalf of Northwest Airlines which subsequently merged with Delta. Mesaba Airlines effectively ceased operations on January 4, 2012, when all aircraft and personnel were transitioned to the Pinnacle Airlines operating certificate. Mesaba's operating certificate was surrendered on July 31, 2012., Delta Air Lines, Inc. ("Delta") is a major American airline, with its headquarters and largest hub at HartsfieldJackson 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, Virgin Atlantic, and Virgin Australia. Regional service is operated under the brand name Delta Connection., Subject: freedom airlines, Relation: airline_alliance, Options: (A) air france (B) delta air lines (C) oneworld (D) skyteam (E) star alliance
Output: skyteam