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
Gdańsk Lech Wałęsa Airport to take off and land safely as the era of modern jet aircraft began. The old airport in Wrzeszcz was officially closed on 1 May 1974 and it practically ceased to exist as a large housing estate was built on its grounds. Nowadays only a few remaining elements of the old Wrzeszcz airport infrastructure can be found. After the closure of the old airport, the new one was built and it opened in 1974 near the village of Rębiechowo (on westernmost land incorporated into the Gdańsk borough of Matarnia in 1973). The airport acquired its current name in 2004. There