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
Sendai Airport of the passenger terminal, rendering electrical equipment, transformers and safety equipment inoperable. Operations at Sendai as well as Odate-Noshiro Airport and Sado Airport, which had been controlled by Sendai Airport control tower, were suspended. Some 1300 people were stranded within the terminal until 13 March, when they were evacuated. By 17 March military engineers partially opened the airport for tsunami response flights. To reopen the airport, on 16 March 2011, a U.S. Air Force MC-130P Combat Shadow from the 17th Special Operations Squadron infiltrated a team from the 320th Special Tactics Squadron from Kadena Air Base into Matsushima, Miyagi, then