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
Saline County Regional Airport (which assigned SUZ to Suria Airport in Papua New Guinea). The airport is located on a site donated to Saline County by ALCOA in August 2002. Construction began in November 2002 and the airport opened on March 12, 2007. The existing Saline County Airport , also known as Watts Field, was closed after the new airport opened. Saline County Regional Airport has one runway designated 2/20 with an asphalt surface measuring 5,001 by 100 feet (1,524 x 30 m). For the 12-month period ending August 31, 2009, the airport had 45,500 aircraft operations, an average of 124 per day: 99%