to Capital Airport from the northeast and east of the city center, respectively. Driving time from city center is about 40 minutes under normal traffic conditions. The Capital Airport Express line of Beijing Subway and the Capital Airport Bus serves the Capital Airport. Beijing Daxing International Airport The Beijing Daxing International Airport (IATA: PKX) located south of the city in Daxing District bordering the city of Langfang, Hebei Province, opened on September 25, 2019. The Daxing Airport has one of the world's largest terminal buildings and is expected to be a major airport serving Beijing, Tianjin and northern Hebei Province. Daxing Airport is connected to the city via the Beijing–Xiong'an intercity railway, the Daxing Airport Express line of the Beijing Subway and two expressways. Other airports With the opening of the Daxing Airport in September 2019, the Beijing Nanyuan Airport (IATA: NAY), located south of city center in Fengtai District, has been closed to civilian airline service. Other airports in the city at Liangxiang, Xijiao, Shahe and Badaling are primarily for military use. Visa requirements for air passengers , tourists from 45 countries are permitted a 72-hour visa-free stay in Beijing. The 45 countries include Singapore, Japan, the United States, Canada, all EU and EEA countries (except Norway and Liechtenstein), Switzerland, Brazil, Argentina and Australia. The programme benefits transit and business travellers with the 72 hours calculated starting from the moment visitors receive their transit stay permits rather than the time of their plane's arrival. Foreign visitors are not permitted to leave Beijing for other Chinese cities during the 72 hours. Trains Stations Beijing has four main railway stations: Beijing railway station, Beijing North railway station, Beijing West railway station, Beijing South railway station. The latter two are among the biggest railway stations in the world. Beijing Chaoyang railway station is a station for high-speed trains from the northeast. Other railway stations in urban Beijing include: Beijing East, Beijing Fengtai, Guang'anmen, Changping North. The Hepingli railway station is no longer in service. Several more stations are under construction. Beijing Fengtai railway station will be a very large station in southwest Beijing with both high-speed and conventional services calling at it. Beijing Sub-Center railway station is situated in Tongzhou District and will be both a terminus and an intermediate station on multiple intercity lines. Railways Beijing is a major railway hub in China's railway network. The following eight major railways radiate