Japan Air System Co., Ltd. (JAS) (日本エアシステム, Nihon Ea Shisutemu) (IATA: JD, ICAO: JAS, Call sign: Air System) was the smallest of the big three Japanese airlines. In contrast to JAL and ANA, its international route network was very small, but its domestic network incorporated many smaller airports that were not served by the two larger airlines. As an independent company, it was last headquartered in the JAS M1 Building at Tokyo International Airport (Haneda Airport) in Ōta, Tokyo. It has since merged with Japan Airlines.

JAS was famous for its variety of aircraft liveries; Amy Chavez of The Japan Times described the rainbow liveries as "abstract." Many of its color schemes in the 1990s were designed by film director Akira Kurosawa.

The airline's slogan was "Good Speed Always".

The company was originally formed as Toa Domestic Airlines (東亜国内航空, Tōa Kokunai Kōkū) (TDA) in a merger between Toa Airways and Japan Domestic Airlines on May 15, 1971. It adopted the Japan Air System (JAS) name on April 1, 1988.

In 1988 Japan Air System began service from Narita to Seoul, South Korea, and by 1993 JAS was also flying to Singapore and Honolulu. In 1995 the airline had 99 domestic routes, some international routes, 64 offices in Japan, one office in Seoul, and one office in Guangzhou, People's Republic of China.

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