Douglas DC-4 / C-54 Skymaster

Douglas. A piston airliner.

Seats: Mixed 44, Coach 60
Range: 4,200 km
Cruise: 345 km/h
Payload: 7,000 kg
Take off run: 1,400 m
Fuel burn: 560 kg per block hour
Reference price: $380,000 in 1947 dollars
Production ends: 1947-08-09
Confidence: estimated (to be verified)

Source: Production of the DC-4 ended on 9 August 1947 (Wikipedia, 1947 in aviation). Other figures follow Phase 1 research (Wikipedia Douglas DC-4); range is a maximum-fuel figure.