Japan Air System (JAS) was the smallest of the big three Japanese airlines, headquartered in the JAS M1 Building at Tokyo International Airport (Haneda Airport) in Ōta, Tokyo. 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. 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.