The bus chassis variant of the International S series is a cowled bus chassis (conventional style) that was produced by International Harvester (later Navistar International) from 1979 to 2004. Produced primarily for school bus applications, the chassis was also produced for other applications, including commercial-use buses and cutaway-cab buses. In addition, the cowled chassis formed the basis for front-engine and rear-engine stripped chassis produced for bus applications.