The SNCAN Potez 631 was the second production variant of the Potez 63 project, which was a project intended to provide France with modern heavy fighter capabilities and which eventually led to one of the most prolific and versatile series of combat aircraft to be built by the French aeronautical industry at the beginning of World War II. The 63 series, originally conceived in 1934, yielded not only strategic fighters but also light bombers as well as attack and reconnaissance planes, resulting in the production of more than 1,100 aircraft of different variants in the series by June 1940. This elegant aircraft remained in active service during the German occupation, and approximately 250 additional planes built in that period were used by the Luftwaffe as transport and liaison aircraft of the Vichy Air Force, the Italian Regia Aeronautica, and of the Romanian Air Force.

It was introduced in Update 1.73 "Vive la France" along with the initial French aviation tree. The Potez 631 is the second variant of the Potez found in the French Tech Tree dedicated for air-to-air combat. Compared to the previous Potez 630, the 631 features six wing-mounted 7.5 mm machine guns, which alongside the two 20 mm cannons mounted in the nose, give the Potez a powerful armament for its rank. However, this armament comes at the cost of speed, the added weight and already mediocre airframe coupled with less powerful engines than the previous variation makes this aircraft ineffective in duelling. Thus, it should be played in a more passive role, with boom and zoom tactics instead of rushing the center of the map.