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
Kos International Airport Kos International Airport Kos International Airport "Hippocrates" () is an airport serving the island of Kos, Greece. The airport is located near to Andimachia village. It is also the second-closest airport to Bodrum after Milas-Bodrum Airport. The airport was opened on 4 April 1964. In 1974 the runway was extended to 2,400 metres. With the increased traffic at the airport in 1980 was built a new terminal building. In 1997, the terminal building was renovated and expanded. In December 2015 the privatisation of Kos Island International Airport and 13 other regional airports of Greece was finalised with the signing of