A bit of useless info re the J52 and PNG...read somewhere a few years ago that one of the years in the early 30's PNG carried more tonnage of airfreight than the rest of the world combined.
Not useless information, but fact. It was the G31's that performed this feat however, not the JU52. The JU52's came to PNG much later, post war, and were operated by Gibbes Sepik Airways. All well documented in
Sepik Pilot, by the late James Sinclair.