Keystone Aircraft
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Keystone Aircraft Corporation was an early American airplane manufacturer.
The first Keystone B-3A bomber built, serial number 30-281
Naval Aircraft Factory PN
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The Naval Aircraft Factory PN was a series of open cockpit American flying boats of the 1920s and 1930s. A development of the Felixstowe F5L flying boat of the First World War, variants of the PN were built for the United States Navy by Douglas, Keystone and Martin.
Naval Aircraft Factory PN-9, illustrating the characteristic hull chines
Douglas PD-1s of VP-4 over Hawaii, in 1930
A Keystone PK-1