| 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
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