Nanjing Lukou International Airport (IATA: NKG, ICAO: ZSNJ) is the main airport serving Nanjing (the capital of Jiangsu Province) and a major airport serving the Yangtze River Delta area. As of 2020, it will be the 12th busiest civil airport in China, dropping one place from 2019 after being overtaken by Zhengzhou Xinzheng International Airport. It is located in the suburban Jiangning District, over 35 km (22 mi) south of the city center, and is connected to Nanjing and neighboring towns by expressways. Phase I of the Ninggao Intercity Line and Line S1 of the Nanjing Metro link the airport with Nanjing South railway station.