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
Žilina Airport 4 May 1972, and the airport was officially opened on 2 August 1974. Žilina Airport Žilina Airport is an airport serving Žilina, Slovakia. It is located near the village of Dolný Hričov, approximately 10 km west of Žilina itself. The airport is used for both international and domestic flights, as well for private flights, amateur sport flights, air ambulance flights and other special flights. It also serves as primary training airport for students of air transport-related majors at the University of Žilina. The airport was built in the 1970s to replace the old Brezovský Majer airport, to give way to