Restore the side frame if it‘s missing!

Designation Official, Popular Name(s) Manufacturer 1st Flight or Appearance Role(s)/Notes


OB                                Boeing      1923    proposed observation biplane amphibian

O2B (DH-4)                        Boeing      1925    USN/USMC observation DH-4

OC          Falcon                Curtiss     1928    redesignated F8C-1/3

O2C         Helldiver             Curtiss     1930    USN/USMC - modified F8C-8

O3C         Helldiver             Curtiss     1933    USN redes. O2C - prototype SOC

OD (O-2)    Milirole              Douglas     1927    USMC O-2C

O2D                               Douglas     1934    USN scout amphibian - competitor SOC/O5U

EO                                Elias       1923    USN obervation EM

OE (L-19)   Bird Dog              Cessna      1950    USN/USMC L-19 - later O-1

OF (OV-1)   Mohawk                Grumman     1959    cancelled USMC OV-1

OJ                                Ber.-Joyce  1929    light USN/USMC observation biplane

OK                                Keystone    1929    light USN observation

OL (OA-1)                         Loening     1925    USN/USMC battleship observation biplane
                                                      amphibian OA-1

O2L                               Keys.-Loe.  1932    USN patrol amphibian

MO                                Martin      1924    USN observation land/seaplane

M2O                               Martin      1923    USN observation flying boat

NO                                N.A.F.      1923    USN observation - N.A.F.-built M2O

OO                                Viking      1930    USCG observation flying boat

OP                                Pitcairn    1931    USN/USMC autogyro observation

UO                                Vought      1922    USN/USCG observation VE-7/9 - later redes. to FU

O2U (O-28)  Corsair               Vought      1926    USN/USMC scout/observation biplane

O3U         Corsair               Vought      1930    USN modified/reengined O2U - redes. to SU

O4U         Corsair               Vought      1940    USN modified O3U

O5U                               Vought      1934    USN scout amphibian - competitor O2D/SOC

OY (L-5)    Sentinel              Consolid.   1945    USN/USMC observation L-5

OZ                                Penn. Air.  1934    USN N2Y rebuilt into monoplane autogyro

O-1         Falcon                Curtiss     1924    observation; some converted to A-3 attack version, BT-4 basic trainer

O-1         Bird Dog              Cessna      1962    USAF/Army observation, liaison, FAC - redes.
                                                      L-19

O-2 (OD)    Milirole              Douglas     1924    observation aircraft; O-2K aircraft converted to BT-1

O-2         Skymaster, Oscar Pig, Cessna      1961    push-pull prop. twin boom FAC, recon., psy-war
            Duck, Super Skymaster

O-3                               Wright      1925    observation

O-3         Quiet Star            Lockheed    1968    DARPA/Army experimental
                                                      quiet, low-altitude night observation
                                                      platform

O-4                               Martin      1925    observation

O-4                                           1974    designation reserved for ZO-4 - LTA observation?

O-5                               Douglas     1924    armed seaplane - redes. DOS

O-5                               DeHavilland 1997?   Army recon. mod. civ. Dash 7

O-6                               Thom.-Mor.  1926    all-metal Douglas O-2

O-7         Milirole              Douglas     1926    reengined O-2

O-8         Milirole              Douglas     1926    reengined O-2

O-9         Milirole              Douglas     1926    reengined O-2

O-10                              Loening     1928    amphibian observation - redes. OA-2

O-11        Falcon                Curtiss     1926    reengined O-1

O-12        Falcon                Curtiss     1930    reengined O-11

O-13        Falcon                Curtiss     1930    reengined O-11 transport

O-14                              Douglas     1928    light trainer seaplane

O-15                              Keystone    1928    light trainer seaplane

O-16        Falcon                Curtiss     1930    reengined O-11

O-17                              Consolid.   1928    observation PT-3

O-18        Falcon                Curtiss     1930    reengined O-11

O-19                              Thom.-Mor.  1929    all-metal observation

O-20                              Thom.-Mor.  1929    reengined O-19

O-21                              Thom.-Mor.  1929    reengined O-19

O-22                              Douglas     1929    observation

O-23                              Thom.-Mor.  1928    reengined O-19

O-24                              Douglas     1933    modified O-43

O-25        Milirole              Douglas     1929    reengined O-2

O-26        Falcon                Curtiss     1939    reengined O-1

O-27                              Gen. Avia.  1931    observation
                                  (formerly
                                  Fokker)

O-28 (O2U)                        Vought      1928    observation - evaluation USN O2U

O-29        Milirole              Douglas     1929    reengined O-2

O-30                              Douglas     1930    3-place observation

O-31                              Douglas     1930    gull-wing observation

O-32        Milirole              Douglas     1929    reengined O-2; some converted to BT-2

O-33                              Thom.-Mor.  1930    reengined O-19

O-34                              Douglas     1930    observation - development O-22

O-35                              Douglas     1931    observation

O-36                              Douglas     1931    2nd prototype of O-35; prototype of B-7

O-37                              Keystone    1930    observation - development O-10

O-38        Milirole              Douglas     1930    reengined O-2

O-39        Falcon                Curtiss     1931    reengined O-1

O-40        Raven                 Curtiss     1931    observation

O-41                              Thom.-Mor.  1931    observation

O-42                              Thom.-Mor.  1931    observation project

O-43                              Douglas     1931    parasol-wing observation - modified O-31

O-44                              Douglas     1933    amphibian; redesignated from B-11; redes. to OA-5 in 1935

O-45                              Martin      1935    evaluation observation B-10

O-46                              Douglas     1935    observation - modified O-43

O-47                              North Amer. 1937    observation

O-48                              Douglas     1934    reengined O-46

O-49        Vigiliant             Stinson     1939    observation - later L-1

O-50                              Bellanca    1940    observation & liaison

O-51        Dragonfly             Ryan        1943    observation & liaison

O-52        Owl                   Curtiss     1940    observation & liaison

O-53        Havoc                 Douglas     1940    proposed observation - modified A-20B

O-54        Voyager               Stinson     1940    observation civ. Stinson 105

O-55        Ercoupe               Erco        1941    observation

O-56        Lexington             Lockheed    1943    armed recon. development of B-34; redes. to RB-34B, then to B-37

O-57        Grasshopper           Taylorcr.   1941    observation - later L-2

O-58        Defender              Aeronca     1941    observation - later L-3

O-59        Cub                   Piper       1941    USAAF/Army observation - later L-4

O-60                              Kellett    1942    redes. R-2 - autogyro observation

O-61                              G&A Aircr.  1941    autogyro observation

O-62        Sentinel              Stin.Vult.  1942    light observation - production O-54

O-63        Cadet                 Interst.    1941    light observation

OA-1 (OL)                         Loening     1925    Army - redes. COA-1

OA-2                              Loening     1929    Army - modified OA-1/redes. O-10

OA-3        Dolphin               Douglas     1933    USN observation - redes. C-21

OA-4 (RD)   Dolphin               Douglas     1936    observation amphibian - redes. C-26

OA-4M       Skyhawk II, Mongoose  Douglas     1978    USMC FAC A-4M - modifed TA-4F with dorsal
                                                      "hump" for additional avionics and tail cap

OA-5                              Douglas     1935    rescue amphibian; redes. from O-44

OA-6                              Consolid.   1937    proposed 2-engine monoplane amphibian

OA-7                              Douglas     1937    planned observation amphibian - reengined OA-4

OA-8 (JRS)                        Sikorsky    1937    observation amphibian

OA-9        Goose                 Grumman     1938    USAAF observation amphibian - redes. to A-9 in 1948
(JRF-1/1A)

OA-10       Catalina              Consolid.   1942    rescue amphibian PBV (PBY); redes. to A-10 in 1948
(PBY)

OA-10       Thunderbolt II,       Fairchild   1987    FAC A-10
            Warthog, Hog, SBD     Republic
            (Silent But Deadly), Thud II, SLAT (Slow Low Aerial Target), Porker

OA-11                             Sikorsky    1941    modified OA-8

OA-12       Duck                  Grumman     1942    transferred USN J2F - redes. to A-12 in 1948

OA-13       Goose                 Grumman     1942    reengined OA-9
(JRF-6B)

OA-14       Widgeon               Grumman     1942    similar to OA-13 - smaller

OA-15       See Bee               Republic    1942    mod. commercial amphibian

OA-37       Dragonfly, Tweety     Cessna      ?       FAC A-37
            Bird

OC-135      Stratolifter,         Boeing      1993    mod. WC-135B - obser. platform to support
            Open Skies                                Open Skies treaty

OH-4                              Bell        1962    observation H-4 - LOH competitor - redes. HO-4

OH-5                              Hiller      1962    observation H-5 - LOH competitor - redes. HO-5

OH-6        Cayuse, LOacH,        Hughes      1962    Army LOH H-6 - redes. HO-6
            Egg, Little Bird, Olive on a Toothpick, Super Bee

OH-6        The Quiet One         McDD        1988    modified, less noisy OH-6
            Little Bird, Olive on a Toothpick

OH-6B       Super Cayuse,         Hughes      1988    modified ANG H-6
            Little Bird, Olive on a Toothpick

OH-8        Defender, Little Bird,McDD        1981    Army alleged des. light attack - modified
            Olive on a Toothpick, Super Bee           civilian Model 500MD - actually
                                                      AH-6A/MH-6A

OH-13       Sioux                 Bell        1946    USAAF/Army 3-seat observation H-13 - Army
                                                      OH-13E redes. from H-13E in 1962

OH-23       Raven                 Hiller      1962    Army observation H-23 - all H-23s redes. as OH-23

OH-43       Huskie                Kaman       1962    observation H-43 - redes. HOK

OH-58      Kiowa                 Bell        1968    light multirole, observation H-58

OH-58D      Aeroscout             Bell        1987    MMS-equipped advanced OH-58

OH-58D      Warrior,              Bell        1988    heavily-armed modified OH-58 with MMS, RWR, IR
            KiowaWarrior                              suppressors - AKA (unofficially) AH-58D

OP-2E       Neptune               Lockheed    1967    sensor planting, electronic recon.,observation
                                                      P-2

OQ-2 (TDD)                        Radioplane  1941    unmanned aerial target; redes. A-2
                                  /Frankfort

OQ-3                              Radioplane/ 1941    aerial target
                                  Frankfort
								  
OQ-4                              Brunswick-  1943    experimental target
                                  Balke-Collender Co.
								  
OQ-5                              ?           1943    experimental target
				  
OQ-6                              Radioplane  1945    high speed target, service test

OQ-7                              Radioplane  1943    exper. OQ-3 variant for use over water

OQ-8?
OQ-9?
OQ-10?

OQ-11                             Simmons     1941    experimental target
                                  Aerocessories
								  
OQ-12                             Radioplane  1941    experimental target

OQ-13                             Radioplane  1941?   OQ-3 variant for use over water

OQ-14                             Radioplane/ 1941    aerial target
                                  Frankfort

OQ-15                             ?           1945    experimental target

OQ-16                             Frankfort   1941    aerial target
(TD3D)

OQ-17                             Radioplane  1942    aerial target
(TD4D)

OQ-18                             ?           1945    large experimental target

OQ-19                             Radioplane  1946    aerial target

OSE                               Edo         1945    USN light scout seaplane - redes. SO2E

OS2E                              Edo         1945    modified OSE

OSN                               N.A.F.      1938    USN battleship-based scout

OS2N        Kingfisher            N.A.F.      1942    USN/USMC - N.A.F. built OS2U

OSS                               Stearman    1938    USN battleship-based scout

OSU         Corsair               Vought      1936    USN/USMC - modified O3U

OS2U        Kingfisher            Vought      1938    USN/USMC observation, ASW, light bomber

OT-47       Citation              Cessna      1997?   USAF - mod. T-47 for counter-drug tracking

OV-1 (OF)   Mohawk                Grumman     1962    Army STOL observation V-1; redes. AO-1

OV-10       Bronco,               Rockwell    1965    USMC/Army/USAF twin-boom STOL , FAC V-10
            Double-Breasted Hummingbird

OV-10D+     J-STARS, Bronco       Rockwell    1988    USMC SLEP OV-10D - J-STARS
All pages ©copyright Andrew Chorney, 2007


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