Lockheed L-749 Constellation

Lockheed. A piston airliner.

Seats: Mixed 54, Dense 62
Range: 5,600 km
Cruise: 470 km/h
Payload: 8,500 kg
Take off run: 1,600 m
Fuel burn: 880 kg per block hour
Reference price: $900,000 in 1947 dollars
Enters service: 1947-05-01
Production ends: 1951-12-31
Confidence: estimated (to be verified)

Source: First flight 14 March 1947; Pan Am flew the first round-the-world service with an L-749 starting 17 June 1947 (Wikipedia, Lockheed Constellation; 1947 in aviation). The May 1947 order date and the end of production are estimates.