Japan Air System Co., Ltd. (JAS) (日本エアシステム, Nihon Ea Shisutemu) was the smallest of the big three Japanese airlines.

As an independent company, it was last headquartered in the JAS M1 Building at Haneda Airport in Ōta, Tokyo.

[2] In 1988, Japan Air System began service from Narita to Seoul, South Korea, and Taiwan, and by 1993 JAS was also flying to Singapore, Honolulu and Indonesia.

[4] In 1996, Japan Air System held a contest for designing the livery of the Boeing 777.

It was the first major airline industry realignment in Japan in three decades, and partly a consequence of the slump in worldwide air traffic following the September 11, 2001 attacks in the United States.

On October 2, 2002, they established a new holding company, Japan Airlines System (日本航空システム, Nihon Kōkū Shisutemu), with Isao Kaneko as CEO.

[citation needed] At the time of its integration into JAL, JAS operated the Airbus A300, Boeing 777, MD-80 and MD-90.

[40] Japan Air System, for a period, painted a McDonnell Douglas DC-10 in a Peter Pan color scheme.