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
Trams in Graz gauge and became part of the tram network. The resulting long outer section of tram route 1 still retains many light railway features, with its off-street routing and long stretches of single track. The Graz tram network reached a peak in 1950. Growing car ownership, and the growth of residential areas in outer reaches of the city not served by the trams, lead to a fall in tram usage and eventually, after 1950, the closure of several tram routes. The city introduced trolleybuses in 1941 to serve the outer areas of the city, but these were replaced by motor buses