Matsumoto Airport (松本空港) (IATA: MMJ, ICAO: RJAF), also known as Shinshu-Matsumoto Airport, is an airport located 5 NM (9.3 km; 5.8 mi) southwest of central Matsumoto, Nagano Prefecture, Japan. Opened on July 16, 1965, Matsumoto Airport is located approximately 9 kilometers southwest of the center of Matsumoto city, straddling the border between Matsumoto and the city of Shiojiri, Nagano. The airport is located roughly in the center of Nagano Prefecture. Regularly scheduled flights are for domestic service only. It is located at the highest elevation (657.5 m) of any commercial airport in Japan, and is surrounded by high mountains, which impose restrictions on the type of aircraft which can service the destination. The runway was lengthened to 2000 meters in 1994 to accommodate jet aircraft