Summary The Messerschmitt Me 323 Gigant was the largest land-based transport aircraft during WWII, with 198 built. The Junkers Ju 287 had one complete flying prototype with six engines and a max speed of 347 mph. The Latécoère 631 was a French-made civil transatlantic flying boat with a short operational duration. I appreciate it when our loyal Simple Flying readers ping me with suggestions for article topics. This article is in response to reader requests for us to explore the six-engine planes of WWII. Related What WW2 Planes Had 4 Engines? 4-engines were mainly the purview of strategic bombers during...