The Aero L-39 Albatros is a high-performance jet trainer aircraft developed 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 first turbofan-powered trainer produced,and a light ground attack fighter as well .........when you pitch up to got straight (90°-85°) avoid pitching down (84°-0°) you have to continue pitching up (90°-360°) to do a circle and return to (0-80-84)degrees if you pitch down after going straight (90degree) you will llse control and spin so fast then you go boom ! gain altitude slowly better than dying (10-75 degree to gain altidute). thats better than gaining them by circle as that altitude you gain you will lose when you are returning to 0°