The first airfield in Juba was cleared in 1929. The Shell Company constructed the first runway in 1931. It was surfaced with crushed laterite. In February 1931, Imperial Airways opened the first 2,670 miles of the weekly Croydon to Tanganyika Territory (now part of Tanzania) portion of the Cape to Cairo air-route, and established a mooring place near Rejaf to the south of Juba, for Imperial Airways' Calcutta flying-boats, which carried passengers between Khartoum and Kisumu. Labourers had been settling on the land that has since become the Juba airport's present location and, in 1934, when the Juba aerodrome was expanded and cleared, these residents were relocated. By 1976, the runway had been expanded to 2,400 by 45 meters and paved with asphalt. Access roads leading to the terminal buildings were unsurfaced and "almost impassable during the rainy season." The airport's "very old radio beacon" was located a short distance from the airport, which was also equipped with a weak VHF radio for pilot-to-ground communication. Field lighting was not present. In early February 1977, the airport was the site of an unsuccessful coup attempt, when ex-Anyanya forces attempted to take the airport. As of May 2011, Juba International Airport was undergoing improvements and expansion. The work on the airport included expansion of the passenger and cargo terminal buildings, resurfacing of the runway and installation of runway lights to facilitate night operations. As of July 2011, the day of the country's independence, Juba International Airport had a new runway light system commissioned with simple approach lights for Runway 13/31, runway edge lights, taxiway lights for Exit Delta, Apron edge lights, illuminated windsocks, ATC tower rotating beacon as well as PAPI for both approaches. In 2016, Juba International Airport was ranked the second worst airport in the world in a survey conducted by The Guide to Sleeping in Airports. It was the worst airport in 2017 and the fourth worst in 2019. During this time the terminal consisted of two adjacent tents to facilitate customs and immigration, arrivals and departures. A new, smaller terminal was built on the site of the original terminal by the Chinese. The new terminal was inaugurated on 29 October 2018.