Originally known as the Mitsubishi MU-300 Diamond, the Beechjet 400 is a light business jet manufactured initially by Mitsubishi Heavy Industries and eventually by the Beech Aircraft Company (Hawker Beechcraft), an American planemaker that is now a part of defense and aerospace conglomerate Textron. In total, over 900 aircraft have been delivered to customers over the years, including variants produced by both major manufacturers.
