before 1939-08-26 and is the same type as yakovlev yak-28 was an aircraft that flew and is called what?
(AND aviation.aircraft (AND (JOIN (R aviation.aircraft_model.aircraft) (JOIN aviation.aircraft_model.aircraft_type (JOIN aviation.aircraft_type.aircraft_of_this_type m.04190z))) (le aviation.aircraft.first_flight 1939-08-26^^http://www.w3.org/2001/XMLSchema#date)))