Most scheduled international flights are served by Taoyuan International Airport in nearby Taoyuan City. Taipei Songshan Airport, at the heart of the city in the Songshan District, serves domestic flights and scheduled flights to Haneda Airport in Tokyo, Gimpo International Airport in Seoul, and about 15 destinations in the People's Republic of China.  Songshan Airport is accessible by the Taipei Metro Neihu Line; Taoyuan International Airport is accessible by the Taoyuan Airport MRT.