Graz Airport camp, run by the governments of Franz Joseph I of Austria and Charles I of Austria. The first domestic passenger flight in Austria in 1925 serviced the route Vienna–Graz–Klagenfurt. In 1930 Yugoslav flag-carrier Aeroput introduced regular flights linking Yugoslav capital Belgrade with Vienna with stops in Zagreb and Graz. In 1937, the construction of a terminal building began due to increase in the number of passengers. After the end of the Second World War, however, Austria was forbidden to possess an aviation fleet, neither military nor civil. After reopening of Austrian airspace in 1951, a new concrete runway of was
Simmering-Graz-Pauker (trams, metro ("Silver Arrow" and "V-wagon"), trains). During the 1950s Simmering-Graz-Pauker A.G. developed the SGP M-222 Flamingo, their first aircraft. It was a conventional twin engine monoplane, smaller than many but seating four in two rows. The first prototype flew for the first time on 15 May 1959 but was lost in a fatal crash during single engine tests on 2 August 1959. Development work continued on a second aircraft which first flew in 1960 and a third followed in 1962. The fourth aircraft, now renamed the "Simmering-Graz-Pauker SGP.222" was intended as a production prototype and demonstrator and appeared at