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An exceptional opportunity to observe a type of aircraft of which there are only 74 in the world, most of which have been converted into a cargo version, and more of them are flying in USA. This 737-400 had it's first flight in January 1992 and was than ( in 2015. ) converted into a freighter. On May 14th it performed a two short test flights at Belgrade airport. B737 is still the best selling passenger plane in the history.
