Air France is the national airline of France, headquartered at the Charles de Gaulle Airport in Tremblay-en-France, just outside of Paris. It was founded back in 1933 after a merger between many regional French airlines. It then merged with the Dutch-based KLM in 2003 and now operates under the Air France-KLM group. Although both Air France and KLM still fly under their respective brand names, the conglomerate has become the largest airline in the world in terms of operating revenues. Air France flies to more than 70 countries globally, including 11 destinations in the United States. Its first and business class services, however, have mixed reviews, depending on the type of aircraft you fly in.