Keywords: heinemann xa4d skyhawk heinemannxa4dskyhawk douglas xa4d skyhawk douglasxa4dskyhawk douglas a4d skyhawk douglasa4dskyhawk douglas xa4d douglasxa4d xa4d skyhawk xa4dskyhawk douglas a4d douglasa4d a4d skyhawk a4dskyhawk xa4d a4d prototype flight test flighttest aviation aircraft airplane military aviation militaryaviation douglas aircraft company douglasaircraftcompany douglas aircraft douglasaircraft dac douglas douglas a-4 skyhawk douglasa4skyhawk douglas a-4 douglasa4 a-4 skyhawk a4skyhawk douglas skyhawk douglasskyhawk a-4 a4 skyhawk heinemann's hot rod heinemannshotrod the scooter thescooter scooter aircraft designer aircraftdesigner aeronautical engineer aeronauticalengineer edward henry heinemann edwardhenryheinemann edward h. heinemann edwardhheinemann e.h. heinemann ehheinemann ed heinemann edheinemann heinemann blackandwhite monochrome black and white Edward Heinemann Collection Photo Repository: San Diego Air and Space Museum Archive Edward Heinemann Collection Photo Repository: San Diego Air and Space Museum Archive |