Because of the distance from Pančevo to downtown Belgrade, which at that time required crossing the Danube, a decision was made to build a new airport which would be closer. The airport was planned to be built just across the river Sava, in a neighborhood today known as Novi Beograd. It was opened on 25 March 1927 under the official name of Belgrade International Airport (also known as Dojno polje Airport). From February 1928, the aircraft owned by the first local airline Aeroput started taking off from the new airport. The airport had four long grass runways. The design for a reinforced concrete hangar that was built at the airfield was made by the Serbian scientist Milutin Milanković, better known for his theory of climate change. A modern terminal building was built in 1931, while the landing equipment for conditions of poor visibility was installed in 1936.