Plovdiv, and Burgas (some sources claim Sofia-Burgas with no intermediate stop). In late 1929, the Junkers company was forced to withdraw from the 1926 agreement due to the effects of the Great Depression. Bunavad continued operating amid drastically worsened business conditions until forced to wind-up on an unknown date in 1930. Being a defeated power in World War I, Bulgaria was largely stripped of the right to have its own aviation by the Treaty of Neuilly-sur-Seine. This, added to the paucity of intergovernmental arrangements, largely put paid to any international services that might have been conceived by Bunavad or putative other Bulgarian airlines. Infrastructure Burgas was the only one of the cities served by Bunavad to have established a fully functioning international airport prior to the airline's formation. A modest passenger and mail terminal opened at Sofia's Bozhurishte Airport to serve Bunavad and others in 1927. The city of Varna also opened a facility in time for Bunavad's launch; it was subsequently moved to another site. All other terminal facilities were newly instituted for the new airline's operations. Bunavad rented a headquarters at Sofia's central Bulevard Dondukov and had booking offices at two locations in central Sofia and in each serviced city. The airline rented hangarage facilities at Sofia's Bozhurishte Airfield, restyled Airport in honour of its formation. Routes Sofia – Ruse – Varna and vice versa Vidin – Ruse – Varna & v. v. Sofia – Plovdiv – Burgas & v. v. Fleet All services were flown by Junkers F.13 aircraft. References Defunct airlines of Bulgaria Airlines established in 1927 Airlines disestablished in 1930 1930 disestablishments in Bulgaria