A two-seat jet-powered training aircraft designed to prepare military pilots for flying jet combat aircraft, constructed in the 1950s in Czechoslovakia by Jan Vlcek, Zdenek Rublic and Karel Tomas. The prototype was first flown on 5 April 1959. In 1961, the L-29 won the competition held in Moscow for a jet training aircraft for the Warsaw Pact, defeating the Yak-30 and TS-11 Iskra. Serial production began in 1963, and the Delfins were adopted by the air forces of the USSR and other Warsaw Pact countries, with the exception of Poland, which opted to operate its own TS-11 Iskra aircraft.
In addition to the basic training version, a single-seat aerobatic version L-29A and a two-seat reconnaissance version L-29R, equipped with cameras, were also developed. By 1974, 3,655 examples had been produced at the Aero Vodochody and Let Kunovice factories. Of these, approximately 2,000 went to the USSR, 400 to Czechoslovak aviation, and the remainder to Bulgaria, East Germany, Romania and Hungary.
Later, Delfins entered service with the air forces of the Czech Republic, Slovakia, Azerbaijan, Tajikistan, Georgia, Afghanistan, Egypt, Syria, Iraq, Angola, Mali, Ghana, Uganda and Vietnam. A number of examples retired from military aviation ended up in the United States, Canada, the United Kingdom, New Zealand, South Africa and Slovakia, where they are used by private owners.
The exhibited example, serial number 99 3241, was manufactured in 1969 at the Aero Vodochody factory as part of the 32nd production series. It served in the Czechoslovak and later Czech Air Force. In 2004, it was transferred to the Prague-Kbely Aviation Museum (Letecke muzeum Praha-Kbely), from where it was exchanged for a TS-11 Iskra bis D, serial number 3H-1212, and arrived at the Polish Aviation Museum in 2014.
| Wingspan | 10,29 m |
| Length | 10,81 m |
| Takeoff weight | 3324 kg |
| Maximum speed | 655 km/h |
| Ceiling | 10’900 m |
| Range | 894 km with drop tanks |
| Armament | capability to carry bombs, machine gun pods and unguided rocket launchers weighing 200 kg on underwing pylons |
| Engine | turbojet with centrifugal compressor Motorlet M-701C, thrust 8.7 kN |
