Paris for 31 percent of the GDP of France. According to the Economist Intelligence Unit Worldwide Cost of Living Survey in 2018, Paris was the second-most expensive city in the world, behind Singapore and ahead of Zurich, Hong Kong, Oslo and Geneva. The city is a major rail, highway, and air-transport hub served by two international airports: Paris-Charles de Gaulle (the second busiest airport in Europe after London Heathrow Airport with 69.5 million passengers in 2017) and Paris-Orly. Opened in 1900, the city's subway system, the Paris Métro, serves 5.23 million passengers daily, and is the second busiest metro system in
Paris–Le Bourget Airport Paris–Le Bourget Airport Paris–Le Bourget Airport () is an airport located within portions of the communes of Le Bourget, Bonneuil-en-France, Dugny and Gonesse, north-northeast (NNE) of Paris, France. Once Paris's principal airport, it is now used only for general aviation including business jet operations. It also hosts air shows, most notably the Paris Air Show. The airport is operated by Groupe ADP under the brand Paris Aéroport. The airport started commercial operations in 1919 and was Paris's only airport until the construction of Orly Airport in 1932. It is famous as the landing site for Charles Lindbergh's historic solo transatlantic