Work on the design of aircraft Aeroput MMS-3 was conducted in 1934, the designer was aeronautical engineer Milenko Mitrović - Spirta, whose initials are on the plane as the MMS label (such was then the custom among constructors of Yugoslav aircraft).
Rad na projektovanju aviona Aeroput MMS-3 je obavljen 1934. godine, projektant je bio vazduhoplovni inženjer Milenko Mitrović - Spirta, po čijim inicijalima je avion dobio oznaku MMS (takav je tada bio običaj među konsrtuktorima jugoslovenskih aviona).