Sudan Airways's operations have generally shown losses, and in the early 1980s the corporation was reportedly receiving an annual government subsidy of about £S.500,000. In 1987 the government proposed to privatize Sudan Airways, precipitating a heated controversy that ultimately led to a joint venture between the government and private interests. However, like the railroads and river transport operators Sudan Airways suffered from a shortage of skilled personnel, overstaffing, and lacked hard currency and credit for spare parts and proper maintenance. In the early 1980s, the country's civilian airports, with the exception of Khartoum International Airport and the airport at Juba, sometimes closed during rainy periods because of runway conditions. After the 1986 drought, which caused major problems at regional airports, the government launched a program to improve runways, to be funded locally. Aeronautical communications and navigational aids were minimal and at some airports relatively primitive. Only Khartoum International Airport was equipped with modern operational facilities, but by the early 1990s, Khartoum and seven other airports had paved runways. In the mid-1970s, IDA and the Saudi Development Fund agreed to make funds available for construction of new airports at Port Sudan and Wau, reconstruction and improvement of the airport at Malakal, and substantial upgrading of the Juba airport; these four airports accounted for almost half of domestic traffic. Because the civil war had resumed, improvements were made only at Port Sudan. Juba airport runways were rebuilt by a loan from the European Development Fund, but the control tower and navigational equipment remained incomplete. Airports with paved runways Total: 17 over 3,047 m: 2 2,438 to 3,047 m: 11 1,524 to 2,437 m: 2 914 to 1,523 m: 1 under 914 m: 1 (2020) Airports with unpaved runways Total: 50 1,524 to 2,437 m: 17 914 to 1,523 m: 24 under 914 m: 9 (2020) Ports and shipping In 1990, Sudan had only one operational deep-water harbor, Port Sudan, situated on an inlet of the Red Sea. The port had been built from scratch, beginning in 1905, to complement the railroad line from Khartoum to the Red Sea by serving as the entry and exit point for the foreign trade the rail line was to carry. It operated as a department of SRC until 1974 when it was transferred to the Sea Ports Corporation, a newly established public enterprise set up to manage Sudan's marine ports. Facilities at the port eventually included