Aero L-29 "Viper" Delfin Jet FlightAircraft Type History The Aero L 29 Delfin (dolphin), NATO designation Maya, was Czechoslovakias first locally designed jet aircraft, produced by Aero Vodochody. First flown in 1959, production commenced in 1963 and ceased in 1974 with over 3600 built. The L 29 won a Soviet design competition and became the standard jet trainer for most Eastern Block countries, except Poland. It was also exported to a number of countries. The Soviet Air Force was the