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The Aero L-29 Delfin is a military trainer aircraft and was Czechoslovakia's first locally designed and built jet aircraft. It seats an instructor and a student. The L-29 was produced from 1963 to 1974 with 3500 aircraft built during this period. The maximum speed is 442 kts (510 mph, 820 km/h) and the stall speed is 71 kts (81 mph, 130 km/h). The empty weight of the aircraft is 5,027 lbs (2,280 kg) and the maximum takeoff weight is 7,804 lbs (3,450 kg).