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Which Italian training aircraft served in air forces on four continents?
Short answer
The Aermacchi MB-326, built by Italy's Aermacchi. More than a dozen air forces bought it, and three countries on three continents built it under licence: CAC in Australia, EMBRAER in Brazil and Atlas in South Africa. Production figures range between about 761 and about 800 units.

A trainer built across several continents
More than a dozen air forces bought the MB-326, and three countries on three continents built it under licence: CAC in Australia, EMBRAER in Brazil, and Atlas in South Africa. Production was split between the Italian Aermacchi, the Australian Commonwealth Aircraft Corporation (the CA-30 / MB-326H "Macchi"), the South African Atlas Aircraft Corporation (the Impala Mk I trainer and the single-seat Mk II attack version), and EMBRAER in Brazil (the EMB-326 / AT-26 Xavante). The Italian line was set up at Macchi's facility in Masnago, Varese, in northern Italy.
Australia, South Africa and Brazil
In Australia's case, Macchi delivered 12 aircraft, 18 were assembled from kits in Australia, and another 67 were built by the Commonwealth Aircraft Corporation and Hawker Aircraft. South Africa obtained the licence in 1964 to produce the MB-326M, similar to the "G" model, as the Impala Mk I, and manufacturing began in 1966. EMBRAER produced the aircraft under licence, including a further six aircraft for Togo and ten for Paraguay.
How many were built
Production figures vary by source: around 761 MB-326, though other counts round it up to about 800 when all sub-variants are added. Among them, the three foreign production lines built more MB-326s than Macchi.
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