Tadija Sondermajer proposed to conduct a promotional stage flight with Paris-Bombay-Belgrade with pilot Leonid Bajdak to show the value and capability of Serbian pilots and the safety of air travel helping to spark the public's interest in flight and hopefully bring new shareholders that could save the company from bankrupt. Tadija and Russian born Leonid Bajdak chose to fly Paris to Bombay to Belgrade aboard a French biplane Potez XXV aircraft with a Lorraine-450rich Dietrich engine, nobody had ever flown such a route before, flying over endless uninhabited ranges of the Middle East and southwest Asia. Tadija and Leonid set off leaving Paris on 20 April 1927. The strong winds and desert storms steered them off their course several times, the flight was performed in 15 stages over 11 days, with a route of 14,800 km (9,191-mile) flying over 89 hours of effective flight (daily average of 1,346 km with an average hourly speed of 166 km), the route and climatic conditions in which the flight was performed were very challenging  Bajdak and Sondermajer landed back in Belgrade's Bezanija airport having completed Paris-Belgrade-Aleppo-Basra-Jask-Karachi-Bombay-Karachi-Jask-Basra-Aleppo-Belgrade. They were greeted by a crowd of 30 000 people. Aeroput was established on 17 June 1927, after the historic flight Tadija Sondermajer became famous rescuing Aeroput from bankruptcy; Aeroput shares grew to exceed all expectations. As many as 412 shareholders gathered the required capital of six million dinars, and Aeroput purchased four aircraft. Aeroput’s first planes arrived in early February 1928. Aeroput’s management bought four “Potez 29/2” type biplanes from a French company. Aeroput’s management opted for this type of aircraft because of the local Ikarbus factory in Zemun, under license from the same French company that produced the Potez 25 planes for the Air Force. The first promotional flight was conducted between Belgrade and Zagreb on 15 February 1928. The Potez 29/2 type aircraft, under the name “Beograd”, took to the sky at 9 am, under the command of company director Tadija Sondermajer and Vladimir Striževski.