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
Aomori Airport Aomori Airport The first Aomori Airport was opened in 1964, in the town of Namioka, with a single 1200 x 30 meter runway designed for use with the NAMC YS-11 aircraft. The airport was located at an altitude of 200 meters in a valley surrounded by mountains, which hampered operations during inclement weather. The runway was lengthened to 1350 meters in 1971, widened to 45 meters in 1972, and extended to 1400 meters in 1973. The terminal building was expanded in 1974, and again in 1978. However, due to the geographic limitations of the existing site, design work began on