Skandinavsk Aero Industri A/S formed Kastrup 1937 to produce light aircraft, taking over business previously run by Kramme & Zeuthen. Built several versions of KZ.II trainer (last variant for RDAF). KZ.III 2-seat high-wing was followed by 4-seat KZ.VII Lark built in fair numbers and developed into KZ.X observation type. Final design was KZ.VIII single-seat low-wing aerobatic. Production ceased 1955.