Sultan Aji Muhammad Sulaiman Sepinggan International Airport — Balikpapan, Indonesia

Sultan Aji Muhammad Sulaiman Sepinggan International Airport, coded BPN, serves Balikpapan, a major oil and gas industry center on the eastern coast of Borneo in Indonesia. The field sits just 12 feet above sea level, and a single runway handles it all despite the field's large-airport classification, a reflection of substantial passenger and cargo demand driven by the energy sector. Balikpapan's economy has long revolved around petroleum refining, and BPN handles significant business travel connected to that industry alongside routes to Jakarta, Surabaya, and other Indonesian cities across the archipelago. The airport also sits within reach of East Kalimantan's new capital project, Nusantara, which is expected to draw additional air traffic to the region in the coming years as construction continues on government buildings and housing. BPN's single strip stays busy with a mix of domestic flights and cargo operations tied to Kalimantan's resource-based economy, including timber, coal, and palm oil shipments passing through the surrounding province.