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
Cancún International Airport addition of terminal 4 made Cancun International the first airport in Mexico to have four terminals. Cancún International Airport Cancún International Airport () is located in Cancún, Quintana Roo, on the Caribbean coast of Mexico's Yucatán Peninsula. It is Mexico's second busiest airport, after Mexico City International Airport, but the biggest for international passengers. In 2017, Cancún airport handled 23,601,509 passengers, a 10.21% increase compared to 2016. It has two parallel operative runways that can be used simultaneously. The airport was officially opened in 1974. The airport is operated by Grupo Aeroportuario del Sureste (ASUR). It is a focus city