New Chitose Airport (新千歳空港, Shin-Chitose Kūkō) (IATA: CTS, ICAO: RJCC) is an international airport located 2.7 nautical miles (5.0 km; 3.1 mi) south-southeast of Chitose and Tomakomai, Hokkaidō, Japan, serving the Sapporo metropolitan area. By both traffic and land area, it is the largest airport in Hokkaidō. It is adjacent to Chitose Air Base, a Japan Air Self-Defense Force base which houses F-15 Eagle fighter jets, the Japanese Air Force One government aircraft and a number of smaller emergency response aircraft and helicopters. Chitose and New Chitose have separate runways but are interconnected by taxiways, and aircraft at either facility can enter the other by ground if permitted; the runways at Chitose are occasionally used to relieve runway closures at New Chitose due to winter weather. New Chitose Airport is one of six 24-hour airports in Japan, but it is the only inland airport; also, this airport has daily opening hours limit unlike other 24-hour operational airport terminals. As of 2018, it was the fifth-busiest airport in Japan, serving 23.7 million passengers, and ranked 64th in the world in terms of passengers carried. The 819 km (509 mi) Sapporo–Tokyo Haneda route is the second busiest air route in the world, with 9.7 million passengers carried in 2018.