Savoia-Marchetti S.M. 79Savoia Marchetti S. M. 79 airplane model. The Savoia Marchetti S. M. 79 was a three engine medium aircraft developed by Savoia Marchetti, also known as the Societ Idrovolanti Alta Italia (SIAI) later SIAI Savoia. Initially developed as a fast passenger transport aircraft, it was later adapted for use as a racing aircraft, and later as a medium bomber. From 1936 until 1939 it broke several records, both in the civil and military spheres with the Regia