Invercargill Airport is a fully secured controlled international designated airport located 1.6 km west of the Central business district of Invercargill at the bottom of the South Island of New Zealand. It is the southernmost controlled airport in the Commonwealth. Formed on land reclaimed from the Waihopai/New River Estuary in 1938, the airport was prone to flooding, notably in 1984 when it was inoperable for two months. The Invercargill City Council considered moving the airport back to Dawson Farm, Myross Bush, the original site up to 1942. Instead, a large flood protection scheme was built, but during its construction heavy rain and an unusually high tidal surge flooded it again in 1987. There have been no problems since. The airport has a main secured terminal, a backup international secured terminal and 5 tarmac gates. Invercargill is the eleventh-busiest airport in New Zealand by passenger traffic.