Template:USN observation aircraft

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USN observation aircraft designations, pre-1962
Observation

Boeing: OB  • O2B

Curtiss: OC  • O2C  • O3C

Douglas: OD  • O2D

Elias: EO

Cessna: OE

Grumman: OF

Huff-Daland: HO

Berliner-Joyce: OJ

Keystone: OK

Loening: OL  • O2L

Martin: MO  • M2O

Viking: OO

Pitcairn: XOP

Vought: UO  • O2U  • O3U  • O4U  • O5U

Stinson: OY

Wilford: XOZ
Observation Scout