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
Lyon–Saint-Exupéry Airport Lyon–Saint-Exupéry Airport Lyon–Saint Exupéry Airport (), formerly known as "Lyon Satolas Airport" , is the international airport of Lyon, the third-biggest city in France and an important transport facility for the entire Auvergne-Rhône-Alpes region. It lies in Colombier-Saugnieu, southeast of Lyon's city centre. The airport was inaugurated by President Valéry Giscard d'Estaing on 12 April 1975 and opened to passengers a week later. It was designed to replace the old Lyon–Bron Airport, which is now only used for general aviation. In 1994 the LGV Rhône-Alpes high-speed rail line brought TGV service to the airport, providing direct trains to Paris and