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The CASA/IPTN CN-235 is a medium-range twin-engined transport aircraft that was jointly developed by CASA of Spain and Indonesian manufacturer IPTN. It is operated as both a regional airliner and military transport; its primary military roles include air transport and aerial surveillance.
Development of the CN-235 formally commenced in 1980 following the formation of the Airtech International joint venture on 17 October 1979. Its existence was publicly unveiled at the 1981 Paris Airshow. On 11 November 1983, the prototype CN-235 conducted its maiden flight; the first production aircraft followed on 19 August 1986. On 1 March 1988, the aircraft was put into regular service. Early on, the production of each aircraft was divided, 65% being performed by IPTN while the remainder was performed by CASA. The vast majority of CN-235s have been produced for military customers, several airlines have opted to buy limited numbers for regional services as well. In addition to the standard aircraft, specialised CN-235s have been configured into armed gunships and maritime patrol aircraft.
While both the development and early production of the CN-235 had been performed as a joint effort, the partnership arrangement between CASA and IPTN was only applicable to the Series 10 and Series 100/110 aircraft. Some of the later versions of the CN-235 have been developed by each company independently of the other's efforts. Accordingly, both companies have produced their own derivatives of the aircraft, such as the stretched EADS CASA C-295 and the passenger-orientated Indonesian Aerospace N-245. Over 230 of all versions of CN-235 are in service, and the type has reportedly accumulated more than 500,000 flight hours. Its largest user is Turkey, which operates 59 aircraft.

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