Blue Bird Corporation is a designer and manufacturer of school buses. The Company operates through two segments: Buses and Aftermarket Parts. The Bus segment includes the manufacturing and assembly of school buses to be sold to a range of customers across the United States, Canada and in international markets. The Bus segment also involves the design, engineering, manufacture and sales of school buses and extended warranties. As of October 3, 2015, it sold three types of school buses (Type C, Type D and specialty buses), as well as aftermarket parts. It manufactures school bus bodies, which include its 14-gauge one piece steel bows roof system. The Aftermarket Parts segment consists of the purchase of parts from third parties to be sold to dealers within its network. The segment also includes the sales of replacement bus parts. It manufactures, assembles and sells school buses to a range of municipal, federal and commercial customers.