R4D SkytrainDouglas C 47 R4D Skytrain US Navy airplane model. The C 47 R4D Skytrain was the most commonly used transport in the Allied Air Forces and has operated in every theater of war. A version was even built under license by the Japanese (the Showa L2D), as well as by the Russians (the Lisunov Li 2). It was known under different designations (C 47, C 53, R4D) and different names (Skytrain Skytrooper Dakota "Gooney Bird"), and by the civilian designation DC