In light of the widely reported travel of the Deputy President, Mr Cyril Ramaphosa, on a state visit to Japan in a plane hired from a company owned by the Gupta family and Mr Duduzane Zuma, the son of the President, Mr Jacob G Zuma, and with which company the National Treasury manages an RT-61 contract, (a) what circumstances led to the hiring of an aircraft plane from the specified business, (b) were proper procurement processes followed in hiring the aircraft from the specified business and (c) what are the further relevant details?