The whole flight, upon repeated requests of the Japanese, had to be kept secret, but the news came out five days later on Italian newspapers and the Japanese immediately decided to stop any further flights on the route originally followed, requesting the study of a more southern route. This delayed any progress further and the hitherto foreseen flight in August 1942 of the second S.75 RT MM.60543 had to be cancelled.
At the time of Italy’s 6/40 entry into the war, all Italian-registered SM.75s were placed under military control. The aircraft proved themselves very valuable to the Italian war effort. Germany seized 10 of these aircraft after the Italian armistice in 9/43 and the other surviving aircraft were used by Italian forces on both sides after the armistice.
In 1940, well over 1/2 of Italy’s 1,000 bombers were SM.79s, which also turned out to be one of the best land based torpedo bombers of the war. The SM.79 was used to bomb Malta and, in the summer of 1942, had one its best successes against Operation Pedestal, the Royal Navy effort to relieve Malta. The SM.79II also saw extensive service in North Africa, the Balkans and the Mediterranean. After the armistice, the series III was built for use by the pro-axis Italian Air Force.