Chengdu Shuangliu International Airport ) is the major airport in Chengdu, China. It's the fifth busiest airport in China and 96th all over the world. The airport started service in 1938 as a military airport in the second Sino-Japanese War and World War II. It now acts as an international civil airport with flights to more than 20 international destinations and many domestic airports, and is a hub for Air China and Sichuan Airlines. There's an express-way connecting downtown Chengdu with the airport, and the planned subway system will connect to the airport as well. It's located in the north of Shuangliu County, about 16km southwest from the downtown of Chengdu.