History of Cologne was considered a substitute for the German University of Strasbourg, which became part of France along with the rest of Alsace. Cologne prospered during the Weimar Republic and progress was made especially in governance, city planning and social affairs. Social housing projects were considered exemplary and were copied by other German cities. As Cologne competed to host the Olympics, a modern sports stadium was erected at Müngersdorf. Beginning of the 1920s civil aviation was permitted once more, and Cologne Butzweilerhof Airport soon became a hub for national and international air traffic, second in Germany only to Berlin Tempelhof Airport. At
Districts of Cologne Districts of Cologne Since the last administrative reform in 1975, the City of Cologne is made up of nine Stadtbezirke and 86 Stadtteile. "Stadtbezirk" literally translates as city district, which are further subdivided into "Stadtteile" (city parts). The Stadtteile of Cologne's old and new town ("Alt-" and "Neustadt") further consist of quarters, known as ""Veedel"" in both Kölsch and most often, the Rhinelandic regiolect, as well. City districts are differentiated of being "links-" or "rechtsrheinisch" – "left" or "right of the Rhine", with the old town being left of the Rhine, as are 230,25 km² (56.8 percent of 405,14 km²