The HFB 320 Hansa Jet is an all-metal, twin-engine, 10-seat business jet built by German aircraft manufacturer Hamburger Flugzeugbau between 1964 and 1973. The aircraft's most notable feature is its forward-swept wing, which is mid-mounted in the fuselage. This arrangement allows the wing spar to pass through the fuselage behind the passenger cabin without decreasing cabin volume. As of 2006[update], it remains the only civilian airplane ever to use a forward-swept wing.