The
Douglas Dolphin was an amphibious flying boat. While only 58 were built, they served a wide variety of roles: private air yacht, airliner, military transport, and search and rescue. They had many designations: Douglas Sinbad, Dolphin Model 1, Model 3, Dolphin 113, 114,116, 117, 119, 129, FP-1, 2, 2A, 2B, RD-1, RD-2, RD-3, OA-4, Y1C-21, Y1C-26, Y1C-26A, C-21 and the C-29.