The Keystone K-47 Pathfinder was an airliner developed in the United States in the late 1920s, built only in prototype form. == Design and development == The Pathfinder was an attempt by the Keystone Aircraft Corporation to develop a civil transport version of the successful series of bombers that it was producing for the United States Army Air Corps as the LB-5 and its derivatives.
The Keystone K-47 Pathfinder was an airliner developed in the United States in the late 1920s, built only in prototype form. == Design and development == The Pathfinder was an attempt by the Keystone Aircraft Corporation to develop a civil transport version of the successful series of bombers that it was producing for the United States Army Air Corps as the LB-5 and its derivatives.
Source: Wikipedia "Keystone K-47 Pathfinder" · CC BY-SA 4.0
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