he Aero L-39 Albatros is a high-performance jet trainer aircraftdeveloped in Czechoslovakia to meet requirements for a "C-39" (C for cvicný– trainer) during the 1960s to replace the L-29 Delfín as the main training aircraft.[2] It was the first of the second-generation jet trainers, and the firstturbofan-powered trainer produced, and was later updated as the L-59 Super Albatros and as the L-139 (prototype L-39 with Garrett TFE731 engine).A further development of the design, theL-159 ALCA, began production in 1997. To date, more than 2,800 L-39s have served with over 30 air forces around the world. The Albatros is the most widely used jet trainer in the world; in addition to performing basic and advanced pilot training, it has also flown combat missions in a light-attack role. Atypically, it has never received a NATO reporting name.At the Farnborough Airshow in July 2014, Aero Vodochody announced the launch of the L-39NG, an upgraded and modernised version of the L-39.