On April 1, 1922 an Aero-club was founded, on an initiative of aviators from Thessalonica. Duke Pavle was the president and Tadija Sondermeier, an aviation pioneer was the vice-president.
 

1923
 

The first general plan of Belgrade was adopted on the basis of international auctions announced in 1921. by the City Council on the initiative of the Association of the Serbian engineers and architects.

In 1923, the first car races were held under patronage of King Aleksandar Djordjevic on Banjica, where stadium of football team "Rad" now lies.

On March 25, 1923 Belgrade was for the first time included in the system of the international air traffic. Airplanes of "Franko-Rumen" company landed in Pancevo airport on Paris-Istanbul line.

On September 9, 1923 the first plane took off on a regular line for Bucharest. It was the first commercial night flight in the history of the world aviation. The "Franko - Rumen" company decided so in practical reasons. It was the only way for their plane on the Paris-Belgrade-Bucharest-Istanbul line to reach its final destination before the at the time being famous luxurious "Orient-express" train which left Paris at the same time and with the same destination, but moved during the night as well.

On October 16, 1923, our first tourist agency "Putnik" was founded, being one of the oldest tourist agencies in Europe.
 

1924
 

The first Serbian aircraft factory "Zivojin Rogozarski A.D." began working in Knez Danilova Street. It manufactured several types of aircrafts, the most significant being "IK-3" fighter, one of the best jets of the time. The factory has been operating with full capacity till the bombing of Belgrade in 1941.

In February 1924 the first Yugoslav radio station was founded in Rakovica. Mihailo Simic and Dobrivoje Petrovic, enthusiasts from Belgrade, emitted the test program through a hand-made station. The station had determined program and played records three times a week till it stopped operating in 1926.
 

1925
 

The first attempt of bus traffic in the city. The office of tram and city lights released two buses on the line Slavija-Avala. The line was mainly aimed to picnickers. The regular bus traffic was not established until 1929. The first regular line was Kalemegdan-Terazije-Savinac.
 

1926
 

A student's dormitory "King Aleksandar Karadjordjevic I" was built, presently named "Ivo Lola Ribar", following the project of an architect Victor Lukomsky. It was the first student's dormitory in Balkans.
 

1927
 

In January 1927, the first Association of air traffic "Aeroput" was founded and it operated successfully till the beginning of the WWII. Following the order of a German commander for Serbia, it was closed on 1943.

In May 1927, the first public airport "Aerodrom Beograd" was opened. It was built on the territory of today's Novi Beograd (the remains can still be seen) and the last plane took off from it in 1962.

On April 24, 1927 opening of the first stadium in Belgrade, the stadium of the football club "Yugoslavia" was celebrated. It anticipated 25-30.000 of spectators, had great covered platforms and was surrounded with a concrete wall. It had an athletic track as well as the special training field. It was the first time that the spotlights were introduced in a football field. Today, the "FK Crvena Zvezda" stadium lies on its place.
 

1928
 

The Associations of Friends of Art in Belgrade erected the “Cvijeta Zuzoric” Art Pavilion by the plans of the architect Branislav Kojic. This building was named after a female poet from Dubrovnik, Cvijeta Zuzoric (1555-1600), the most beautiful woman of her time described in numerous poems by Italian and Dubrovnik poets.

On February 15th 1928 the first air lane of our airline, Belgrade-Zagreb, was opened. “Aeroput” Society airplanes “Potez 29” took off from the first permanent civilian port - Belgrade Airport.

October 1928. On the occasion of the tenth anniversary of the breakthrough of the Thessalonica front, the “Victor” monument on the Belgrade fortress was unveiled, which now stands as a symbol of Belgrade. It was created by a sculptor Ivan Mestrovic.
 

1929
 

In March 1929 the first regular radio program was created nine years after the first broadcast in the world. It was initially broadcasted form the SANU building. This year, 61 radio receivers were registered in Belgrade, and the first subscriber was Milutin Dimitrijevic.

In October 1929, a ceremony of the inauguration of the mint factory in Topcider, officially the Institute for the production of bank notes. The decision on founding of this Institute was made by the National Bank Administrative Board. The Topcider Institute was equipped with the most sophistical machinery and cost the state 55 million dinars. There were 137 various experts employed in the institute.