Alert Airport — Alert, Canada

Alert Airport, coded YLT, serves Canadian Forces Station Alert on Ellesmere Island in Nunavut, recognized as the northernmost permanently inhabited place on Earth. Located far above the Arctic Circle, the airport supports military personnel, weather station staff, and signals intelligence operations conducted at this strategically significant outpost. YLT handles resupply flights, personnel rotations, and occasional scientific research missions given Alert's extreme isolation and harsh polar climate. There is no permanent civilian population, and the airfield exists purely to sustain the station's operational needs in one of the most remote and inhospitable environments accessible by aircraft. Alert's airport represents an extraordinary feat of sustaining infrastructure at the edge of the inhabited world.