The Savoia-Marchetti SM.89 was a bomber aircraft made by Savoia-Marchetti. The SM.89 was developed by Alessandro Marchetti and the prototype (MM.543) made its first flight in September 1941 in Vergiate, with the test pilot Lieutenant G. Algarotti behind the sticks.
Read more about Savoia-Marchetti SM.89: Development, Operational Service, Specifications (S.89)