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
Greater Southwest International Airport Greater Southwest International Airport Greater Southwest International Airport , originally Amon Carter Field (ACF), is a now closed commercial airport serving Fort Worth, Texas, from 1953 until 1974. Dallas-Fort Worth International Airport (DFW) opened in 1974 a few miles north of the airport as the planned replacement for both Greater Southwest and Dallas Love Field (DAL) as the single main airport for all scheduled airline flights for the Dallas-Fort Worth Metroplex, although Love Field survives with Southwest Airlines being the major carrier there. The area is now a commercial/light-industrial park serving DFW International, centered along Amon Carter Boulevard, which was