The SIAI-Marchetti S.211 (later Aermacchi S-211 is a turbofan-powered military trainer aircraft designed and originally marketed by SIAI-Marchetti. Some 60 aircraft have been sold to air forces around the world. Aermacchi bought the production rights in 1997. The redesigned M-311 (now M-345) is currently under development by Alenia Aermacchi.