South Sudan Suspends Airline After Plane Crash Black box to be sent to Ukraine to establish cause of crash, says official. South Sudan's president on Wednesday suspended the operation of South Supreme Airlines, the company owning the plane that crashed in the Pieri Town on Tuesday evening, an official statement said. "As a temporary measure to deal with these avoidable air accidents before the laws governing civil aviation are strengthened via legislative means, I am hereby directing Ministry of Transport and Civil Aviation Authority to suspend South Supreme Airlines' operations in South Sudan. This measure is necessary for these institutions to ascertain airworthiness of the remaining South Supreme planes, and restore public confidence in air travel in the country," President Salva Kiir Mayardit said in a statement read out on the state-owned South Sudan Broadcasting Corporation.