According to Turkish sources, the first order was placed in December 1923, with deliveries of 15 aircraft commencing late 1924 (Turkish serials 310-315). First Turkish units to convert to the A20 were the 4th and 6th Tayyare Bolugu (Aircraft Companies) at Gaziernir/Sinyma and Eskisehir respectively. Another ten aireraft arrived at Srnyma (Izmir) from Dessau by boat in April 1925 and were erected there. They were then transferred by air to Eskischir, where Jfa had organized a workshop with their own personnel for conversion of the aircraft to the military version. The observer's cockpit was reconstructed and Madsen machine guns and bomb carriers were fitted.
In the summer of 1925 negotiations took place between the Turkish government and Ka about Junkers aircraft production in Turkey. At the same time, Junkers tried to establish himself in Turkish civil air transport. On August 15 an agreement was concluded with Hans Sachsenberg, the Ka representative: Jfa would -initiate an air transport service and would also build a plant in the -area of Kayseri for production of aircraft and spare engines, to be called Turkische Flugzeug und Motoren AG (Tomtasch), with an eventual annual output of 250 machines. First type to be produced was the A20.
In September 1926 36 aircraft were finally ordered, of which 13 were to be financed by the Turkish Air Association. The Kayseri aircraft factory was then formally opened on October 5.
According to Turkish sources, 30 A20s (701-730) were assembled between August 1926 and September 1928. But a Jfa document on the Company's aircraft sales, which was drawn up in 1929, credits Turkey with 20 A20s in 1925, 41 in 1926 (probably including one replacement for a machine which crashed in Srnyma the year before), two in 1927 and one in 1928.
Between 1928 and 1931 the 27th, 28th, 44th and 45th Tayyare Bolugu, all at Diyarbakir, were equipped with the Junkers A20. In August 1929 eight machines made a 4,700km (2,484 miles) long -distance flight around the whole of Turkey. But the Turks experienced trouble with the engines of the aircraft. From 1929 pilots were entitled to double flying pay when flying the A20. After 1930, the aircraft were barely flown at all. Three crashes in 1930 put an end to the type's operational career. It was replaced by Breguet 19s and Letov S 16Ts.

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