Ioto (Iwo Jima) Airbase — Ogasawara, Japan

IWO is the IATA code for Ioto Airbase, the military airfield on the island long known as Iwo Jima, now officially renamed Ioto and administered as part of Ogasawara, Japan. The island became infamous during World War II for one of the bloodiest amphibious battles in the Pacific theater, fought largely over control of its two airstrips. Today the airfield is operated by the Japan Self-Defense Forces and the US military uses it for carrier landing practice; there is no scheduled civilian service and no public access to the island. IWO functions purely as strategic military infrastructure and a memorial site, with periodic visits limited to veterans' groups, researchers, and official delegations rather than tourists.