Zeppelin-Staaken R.VI
Dating back to World War I, the Zeppelin-Staaken R.VI was among the largest wooden planes produced in the early 1900s. The four-engine strategic bomber was built in Germany. It was among the first military aircraft that had a closed cockpit. There were 18 copies of the aircraft produced though only six survived the war. The others were either destroyed in crashes, were shot down, or had technical issues.
Kawanishi H8K
This flying boat was primarily used for maritime patrol by the Imperial Japanese Navy. The Kawanishi H8K was designed for long-distance flights and was often flown alone, with no backup, over the ocean. The Americans gave this patrolling plane the nickname “Emily” during the war. Whenever “Emily” was said over the radio, they were referring to the H8K. It was first used in combat in 1942, so the aircraft was only fully operational during the second half of WWII.