Question: Régional Compagnie Aérienne Européenne is a subsidiary of an airline carrier that has its corporate headquarters at what location?
Context: Régional Compagnie Aérienne Européenne, or Régional for short, is a subsidiary airline wholly owned by Air France which connects hubs at Paris, Lyon to 49 airports in Europe.  The airline operated in Air France livery, retaining its name in small titles and logo on the front fuselage and engines.  It became the first European operator of the Embraer 190 aircraft in November 2006.  It was headquartered in Bouguenais at the Nantes Atlantique Airport. Corporate headquarters is the part of a corporate structure that deals with important tasks such as strategic planning, corporate communications, taxes, law, marketing, finance, human resources, and information technology.  Corporate headquarters takes responsibility for the overall success of the corporation and ensures corporate governance.  It is sometimes referred to as the head office, which is the location where the executives of a business work and where many of the key business decisions are made.  Generally, corporate headquarters acts as a core when the business is operating.  The corporate headquarters includes: the CEO (chief executive officer) as a key person and their support staff such as the CEO office and other CEO related functions; the "corporate policy making" functions: Include all corporate functions necessary to steer the firm by defining and establishing corporate policies; the corporate services: Activities that combine or consolidate certain enterprise-wide needed support services, provided based on specialized knowledge, best practices, and technology to serve internal (and sometimes external) customers and business partners; the interface: Reporting line and bi-directional link between corporate headquarters and business units.  Most other divisions and branches report to the corporate headquarters and staff may visit there periodically for training or other instructions" (Kimberly: 2014: 22).  The corporate services are often relocated into a separate legal entity called shared services center.  Research shows that the city in which a company is headquartered has a significant influence on the company's activities, including its business practices and its corporate philanthropic giving. Île Tintamarre is a small island with an area of approximately 0.8 km2 .  It is located in the Caribbean Sea, about 3 km from the island of Saint Martin, and is administered as part of the French overseas collectivity of Saint Martin.  The island has no human occupants, but has been inhabited in the past.  Between 1946 and 1950, it was the base for the airline Compagnie Aérienne Antillaise, which flew planes from the island's 500 m airstrip (no longer existent.) Régional Compagnie Aérienne Européenne destinations Comores Aviation International (Compagnie Aérienne de l'Union des iles Comores) is the flag carrier of the Comoros.  It is privately owned and operates domestic scheduled services, as well as charters mainly to tourist destinations in southern and eastern Africa.  Its main base is Prince Said Ibrahim International Airport, Moroni, with a hub at Ouani Airport. The Nieuport-Delage NiD 39 was an airliner produced in France in the late 1920s, developed from the NiD 38.  The airline "Compagnie Aérienne Française" had purchased four examples of the previous aircraft and ordered an improved version with greater passenger capacity from the manufacturer.  Like its predecessor, the NiD 39 was a single-bay biplane of conventional design with an enclosed cabin its passengers and an open cockpit for the pilot.  However, while the NiD 38 could only carry two passengers, the NiD 39 could carry four.  CAF also specified the engine to be used – the Armstrong Siddeley Lynx – although the first eight examples produced flew with the same Hispano-Suiza engine that had powered the NiD 38.  The airline operated around thirty examples on routes between western European cities until 1932. Air Mali, formerly Compagnie Aérienne du Mali (abbreviated as CAM), was an airline based in Mali that was formed by the Aga Khan Fund for Economic Development (AKFED) through its subsidiary IPS, West Africa and the government of Mali in April 2005. Air France (] ; formally "Société Air France, S.A."), stylized as AIRFRANCE, is the French flag carrier headquartered in Tremblay-en-France.  It is a subsidiary of the Air France–KLM 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. CFRNA ("The French-Romanian Company for Air Transport"; French: "Compagnie franco-roumaine de navigation aérienne" ; Romanian: "Compania franco-română de navigație aeriană" ), later CIDNA ("The International Air Navigation Company"; French: "Compagnie internationale de navigation aérienne" ) was a French-Romanian airline, on January 1, 1920. Compagnie Aérienne Corse Méditerranée S.A.E.M. (Corsican: "Cumpagnia Aerea Corsa Mediterrania" ), trading as Air Corsica (formerly "CCM Airlines"), is a French regional airline with its head office on the grounds of Ajaccio - Campo dell'Oro Airport in Ajaccio, Corsica, France.  It operates passenger services from Corsica to continental France.  Its main base is Ajaccio - Campo dell’Oro Airport, with hubs at Figari Sud-Corse Airport, Bastia - Poretta Airport and Calvi - Sainte-Catherine Airport.
Answer: Charles de Gaulle Airport