The story
Aerea Teseo S.A. was founded in September 1945 by a group of Florentine entrepreneurs. Among the investors were Giovanni Caproni and Angelo Ambrosini, both prominent figures in the aircraft manufacturing industry. The first aircraft, a Douglas C-47 already converted to carry passengers, was transferred on September 6, 1946, from Naples to Florence with a false registration. Several months passed while waiting for authorization to begin scheduled flights. Meanwhile, the fleet had grown to include eight Douglas DC3s, derived from Douglas C-47s and converted to carry 22 passengers. These twin-engine aircraft had been used by the United States Army during World War II, and were later abandoned in still acceptable condition at Naples-Capodichino airport..
Flight operations began on 15 April 1947 with a series of routes extending from Northern Italy (Milan) to Sicily (Palermo), with intermediate stopovers in Bologna, Florence, Rome and Reggio Calabria. On 17 September, international flights were commenced, first with Florence-Rome-Barcelona, later followed by one to Brindisi-Istanbul-Ankara.
From Wikipedia’s article on Aerea Teseo, shared under CC BY-SA 4.0.3
