The Lockheed R6V Constitution was a large, propeller-driven, double-decker transport aircraft developed in the 1940s by Lockheed as a long-range, high capacity transport and airliner for the U.S. Navy.

The first time I saw this aircraft was in a photo of a Bearcat and it was in the back ground.

This book covers this and more.

72 pages of history, drawings and photos.