 Aeroput's first flight was a promotional flight that took off from Belgrade to Zagreb at 9 o'clock in the morning on 15 February 1928 with an aircraft Potez 29/2, with license plate X-SECD, called "Belgrade".The pilots were Aeroput's chairman Tadija Sondermajer and pilot , while the first passengers were five journalists and photo reporters from Belgrade media.After a two-hour flight by overcast sky and low clouds over the Sava River, which is a major landmark for pilots, they noticed the towers the Zagreb cathedral.