Sakitama Airfield

Primarily economic reasons. The airfield was a private facility for recreational aviation, which often operates on thin margins. It is believed that the airfield closed due to a combination of declining activity, operational costs, or the expiration of a land lease. The subsequent redevelopment of the land for a more profitable use (a solar farm) confirms its permanent closure for economic reasons.

The site has been completely repurposed. The former runway and surrounding grounds are now occupied by the Nasu South Land Solar Power Plant (那須サウスランド太陽光発電所), a large-scale solar energy farm. All aviation infrastructure has been removed, and the land is dedicated to renewable energy generation.

The airfield was locally and correctly known as Nasu South Land Microlight Park (那須サウスランドマイクロライトパーク). The name 'Sakitama Airfield' and ICAO code 'JP-1089' appear to be erroneous or unofficial identifiers used in some non-Japanese, user-contributed aviation databases. Its significance was purely for recreational aviation. Active from the 1990s until its closure, it served as a local hub for ultralight and microlight aircraft enthusiasts in the northern Kantō region. It operated under Japanese aviation law as a 'jōgai richakuriku-jō' (場外離着陸場), which is a registered 'off-airfield landing and takeoff site' rather than a fully licensed public airport.

Zero. The complete conversion of the site into a major solar power plant makes any prospect of reopening as an airfield infeasible. The land has been fundamentally and permanently altered for a different industrial purpose.