Air Zaïre airline was also operating Curtiss C-46s and DC-4s equipment, leased from Aerovias Panama Airways to complement the Sabena-leased aircraft. After the Republic of the Congo gained independence from Belgium in 1960, the Belgian national airline Sabena continued to operate routes in the country. Plans for the formation of a Congolese airline were delayed due to the Congo Crisis; however, in January 1961 a protocol was signed with Sabena for the creation of a limited liability company to be named "Air Congo". On the company was formed, and incorporated on 28 June with Sabena providing technical assistance and personnel. The Congolese
Sabena had a domestic network that was mainly used by businessmen who wanted to be in their coastal villas for the weekend. In 1938, the airline purchased the new Savoia-Marchetti SM.83, a development of the S.M. 73 with a speed of 435 km/h (270 mph), although it flew services at a cruising speed of about 400 km/h (250 mph). At the outbreak of World War II in 1939, Sabena's fleet totalled 18 aircraft. Its mainstay fleet type was the Savoia-Marchetti SM.73 airliner (it had 11 of the type) and the Junkers Ju 52/3m airliner (it had five). Sabena also had just