When Kai Tak closed, there was only one runway in use, numbered 13/31 and oriented southeast–northwest (134/314 degrees true, 136/316 degrees magnetic). The runway was made by reclaiming land from the harbour and was extended several times after its initial construction. The runway was long when the airport closed, and when it was opened. This runway opened in 1958 and operated until the closure of the airport. Beforehand, in the period of 1945-1955 the airport used a different 13/31 alongside a crossing 07/25. These runways were and .