The De Havilland Mosquito - the RAF's bomber, made almost entirely of wood

damninteresting.com — Its final construction was heat-formed plywood over a wooden frame, with sections glued and screwed for extra strength. It employed Ecuadorean balsawood sandwiched with Canadian birch, a particularly strong and lightweight grade of plywood. Metal was used in only a few parts, including the engine housings and some control surfaces.