AIR-9 The original open cockpit 2-seat low-wing monoplane sport aircraft design, with split flaps and automatic leading edge slats; not proceeded with.[1] AIR-9 The original design reworked with closed cockpits and other refinements but without automatic slats. At least one built, at some stage seen with racing number 31.[1] AIR-9bis Further modifications prompted re-designation to AIR-9bis, introducing a forward sloping windshield and undercarriage trousers. One converted from the AIR-9 or possibly several new built aircraft, seen wearing racing number 32.[1]