Formed 1934 as SAI (Società Aeronautica Italiana), becoming part of Ambrosini industrial group same year. Long series of mainly sporting and training aircraft designed by Sergio Stefanutti, most famous and successful being variants of S.7 high-speed tandem-seater (1939), including Supersette with 350-hp Gipsy Queen (1952). Out of normal rut, Sagittario swept-wing jet (1953) developed into transonic Sagittario II (1956) and ultimately Aerfer Ariete. See also SAI.

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