Question: Who produced a utility aircraft that is a remanufactured and modified Douglas DC-3, conversions include fitting the frame with the new engine produced by Pratt & Whitney Canada? 
Sentence (from "Airtech Canada"): It has also marketed conversions for popular radial-engined transport aircraft such as the Douglas DC-3, de Havilland Canada DHC-2 Beaver and de Havilland Canada DHC-3 Otter.
Relevant evidence: No