The Mitsubishi A6M2-N resulted from a requirement for an aircraft to support amphibious operations that was given in September 1940. It was to be the successor to the Kawanishi N1K1 Kyofu. They were to provide air cover from lagoons and other waterways until airstrips were constructed on land.
Nakajima was chosen to make a floatplane version of the Mitsubishi A6M2 Model 11. Niitake and Tajima were the engineers.
The A6M2-N used a large floatplane with two outriggers. A ventral fin was added for stability. Additional fuel was carried in the float.
Allow was used more in the A6M2-N as it was less corrosive.
The A6M2-N was the only one main floatplane fighter used by any nation during World War II.