Keystone-Loening K-84 "Commuter"
The Keystone-Loening K-84 "Commuter" was a single-engine flying boat. First produced in 1926.
It is similar in configuration to the Sikorsky S-39; the Keystone-Loening is a biplane, while the Sikorsky is a monoplane; the twin-engine Sikorsky S-38 is also similar but with a smaller lower wing. The Keystone-Loening wing also had a small dihedral, while the Sikorsky wings were flat.