The Loening C-4C later the Keystone-Loening K-85 Air Yacht following the merger of the Loening and Keystone companies was an amphibious utility biplane built in the United States in the late 1920s. It was developed by Grover Loening from the C-1 that he had created together with Leroy Grumman incorporating a new fuselage design.
Made by Keystone AircraftLoening Aeronautical Engineering.