Hokkaido Air System Co., Ltd. , or HAC, is a regional airline that operates scheduled services in Hokkaidō and Aomori Prefecture, Japan from a main base of operations at Okadama Airport in Higashi-ku, Sapporo. It is a private company controlled by Japan Airlines, with 86 employees as of July 2018.

Sapporo Airfield , commonly known as Okadama Airport , is a dual-use airport located in Okadama-chō, Higashi-ku, Sapporo, Hokkaido, 4 NM north of the city center of Sapporo. Its scheduled airline service is limited to turboprop flights to other cities in Hokkaidō; larger aircraft use New Chitose Airport, 45 km (28 mi) south of the city. The airport is also used by Camp Okadama of the Japan Ground Self-Defense Force and by corporate and general aviation operators: an adjacent facility houses the air traffic control center for Hokkaido and the Tohoku region. The airport houses the headquarters of Hokkaido Air System.