Ali Air Base — Nasiriyah, Iraq

Ali Air Base, also known as Ngari Gunsa Airport, is located in the remote Ngari Prefecture of western Tibet, China, and holds distinction as one of the highest-altitude airports in the world. XNH serves a dual civil-military function, supporting both limited commercial passenger flights connecting this isolated high-plateau region to Lhasa and other Chinese cities, alongside military operations given its strategic location near sensitive border areas. The airport's extreme elevation presents significant engineering and operational challenges, requiring specialized aircraft performance considerations. Ali Air Base serves the sparsely populated but strategically significant western Tibetan plateau, providing a critical lifeline for the region's small population living at extraordinarily high altitudes.