C-20 Gulfstream USAFUSAF C 20 airplane model. The C 20 is a military modification of the commercial Gulfstream aircraft, manufactured by Gulfstream Aerospace Corporation (GAC) Savannah, Georgia. The C 20 aircraft provide distinguished visitor (DV) airlift for military and government officials. They support the long range low passenger load DV airlift niche, offering worldwide access while including a communications suite which supports worldwide secure voice and data