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
Glasgow Prestwick Airport this tough time in the airport's history, saying that "if it hadn't been for Matthew Hudson the airport wouldn't be here today". In 1994, Irish budget airline Ryanair opened a route to the airport from Dublin, followed by a second route in 1995 to London Stansted. In 1998, a third route to Paris-Beauvais was introduced and Prestwick Airport was subsequently sold by Hudson to the Scottish transport company Stagecoach Group, which then sold it to Infratil in 2001. The resulting rapid growth of Ryanair's low-cost routes saw a peak in passenger numbers, with Prestwick carrying over 1,000,000 passengers in 2001.