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
2017 Orly Airport attack to ram a car filled with explosives into a police patrol on the Champs-Élysées. 2017 Orly Airport attack The March 2017 Île-de-France attacks were a pair of terrorist attacks by the same individual in Garges-lès-Gonesse, an outer suburb of Paris, and at Orly International Airport near Paris on 18 March 2017. The attacker, a 39-year-old man identified as Ziyed Ben Belgacem, was shot dead after attempting to seize a weapon from a soldier patrolling the airport under Opération Sentinelle. At Orly Airport, the attacker shouted that he wanted to kill and die in the name of Allah. the attack is