Tsuiki Air Field (築城飛行場, Tsuiki Hikōjō) (ICAO: RJFZ) is a military aerodrome of the Japan Air Self-Defense Force Tsuiki Airbase (築城基地, Tsuiki Kichi). It is located in on the northeast coast of Kyushum and its borders straddle the municipalities of Tsuiki, Yukuhashi, and Miyako, Japan. The runway extends from west-southwest to east-northeast, with a portion protruding approximately 300 meters into the Gulf of Suo at the western end of the Seto Inland Sea. The JR Kyushu Nippō Main Line runs along the southern border of the base. Since March 2008, the base handles most of the air traffic control operations at Kitakyushu Airport and Yamaguchi Ube Airport.