Supadio International Airport — Pontianak, Indonesia

Just south of the equator on Borneo's western coast sits Supadio International Airport, coded PNK, serving Pontianak, the West Kalimantan capital that straddles the line itself, a geographic quirk locals celebrate with a monument marking the spot just outside the city. The airport runs along the Kapuas River, Indonesia's longest waterway, and functions as the main air link between this remote stretch of Indonesian Borneo and Jakarta as well as other major domestic hubs. Peat and forest fires that periodically blanket the region in haze during dry seasons have, in past years, disrupted flight schedules and cut visibility enough to delay or divert traffic. Garuda Indonesia, Lion Air, and other domestic carriers operate regular routes through PNK, carrying passengers connected to the palm oil, rubber, and timber industries that dominate the regional economy. Pontianak's riverside setting and equatorial climate, hot and humid with heavy year-round rainfall, shape daily operations at the airfield.