Alert Airport (IATA: YLT, ICAO: CYLT) is the world's northernmost permanent airport, located at Alert, Nunavut, Canada, approximately 830 km (520 mi) south of the true North Pole. It is operated by the Canadian Department of National Defence and is part of Canadian Forces Station Alert.A weather station was established on the site in 1950, and in 1957 construction began on the military facilities which are still in use to this day.