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
McCarran International Airport York City, opened on March 15, 1963. The airport was officially renamed McCarran International Airport in September 1968. Further expansion took place between 1970 and 1974 with the construction of the A and B gates. Prior to deregulation, the airport had four dominant carriers: United and TWA served both coasts nonstop from Las Vegas, while Western and Hughes Airwest provided service to destinations in the western US. After the airline industry was deregulated in 1978, the number of airlines serving McCarran doubled from seven to fourteen in only two years. New entrants by 1979 included American, Braniff and Continental. In