Régional Compagnie Aérienne Européenne is a subsidiary of an airline carrier that has its corporate headquarters at what location?
Régional Compagnie Aérienne Européenne: 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. Air France:  Air France's corporate headquarters, previously in Montparnasse, Paris, are located on the grounds of Charles de Gaulle Airport, north of Paris.
Charles de Gaulle Airport