In March 1924, Dobrolet began operating flights from Sevastopol to Yalta and Yevpatoriya in the Crimea. Dobrolet's route network was extended during the 1925–1927 period to include Kazan and regular flights between Moscow and Kharkov were inaugurated. Plans were made for Dobrolet flights to Kharkov to connect with Ukrvozdukhput services to Kiev, Odessa and Rostov-on-Don. During 1925, Dobrolet operated 2,000 flights over a distance of , carrying 14,000 passengers and of freight, on a route network extending to some . Dobrolet was transformed from a Russian to an all-Union enterprise on 21 September 1926 as a result of Sovnarkom resolutions, and in 1928 Dobrolet was merged with Ukrvozdukhput; the latter having merged with Zakavia in 1925. Responsibility for all civil aviation activities in the Soviet Union came under the control of the Chief Directorate of the Civil Air Fleet on 25 February 1932, and on 25 March 1932 the name "Aeroflot" was officially adopted for the entire Soviet Civil Air Fleet. The Communist Party of the Soviet Union Congress in 1933 set out development plans for the civil aviation industry for the following five years, which would see air transportation becoming one of the primary means of transportation in the Soviet Union, linking all major cities. The government also implemented plans to expand the Soviet aircraft industry to make it less dependent on foreign built aircraft; in 1930 some fifty percent of aircraft flying services in the Soviet Union were of foreign manufacture. Expansion of air routes which had taken shape in the late 1920s, continued into the 1930s. Local (MVL) services were greatly expanded in Soviet Central Asia and the Soviet Far East, which by the end of the second Five-Year Plan in 1937 was in length out of a total network of some . The agreement between the Soviet Union and Germany relating to Deruluft expired on 1 January 1937 and wasn't renewed, which saw the joint venture carrier ceasing operations on 1 April 1937. On that date Aeroflot began operations on the Moscow to Stockholm route, and began operating the ex-Deruluft route from Leningrad to Riga utilising Douglas DC-3s and Tupolev ANT-35s (PS-35s). Flights from Moscow to Berlin, via Königsberg, were suspended until 1940, when they were restarted by Aeroflot and Deutsche Luft Hansa as a result of the signing of the Molotov–Ribbentrop Pact, and would continue until the beginning of the Great Patriotic War in 1941.