A subsonic jet trainer aircraft developed in the 1960s in Czechoslovakis by Aero Vodochody,

In the 1950s, the need for jet trainer aircraft became more and more urgent. Concentrated efforts in developing an optimized airframe and indigenous jet engine within the Czechoslovak aircraft industry resulted in the maiden flight of the L-29 in 1959. The definitive step on Aero's way to mass production of jet trainers took place in 1961: the L-29 Delfin won comparative testing of three different prototypes and was declared the most suitable trainer in Eastern Bloc countries. Production and deliveries continued for ten following years, after which the second generation, a more powerful and more efficient L-39 had been developed. Production of the L-39 occupied Aero's workshops and assembly halls during 1970s and 1980s. A number of air forces around the world still utilize the excellent tutoring quality of this affordable airplane.