Hiper DC-3
The conversion from a standard DC-3 using P&W R-1830 engines to P&W R-2000s of 1450 HP was engineered and the actual work was done by HAYES Aircraft out of Birmigham, Alabama The first units were ordered by PANAGRA Airways (part owned by PanAm) N49550, N28335 and N54311 which operated out of the Quito, Ecuador Int. airport at 9,200 ft. AMSL altitude and the more powerful engines provided a much better engine-out performance. USAF also operated a number of Hiper C-47s in Latin America (i.e. S/N 54-8906) plus scores of Hiper Puffin Dragons AC-47s and EC-47s in Viet Nam in the 60s.