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((Navbox
|name = US observation aircraft
|title = United States [[Surveillance aircraft|observation aircraft]] designations, [[United States Army Air Corps|USAAC]]/[[United States Army Air Forces|USAAF]] and [[1962 United States Tri-Service aircraft designation system|Tri-Service]] systems
|state = (({state|autocollapse))}
|listclass = hlist

|group1 = USAAC/USAAF sequence<br><small>(1924–1942)</small>
|list1 = 
* [[Curtiss Falcon|O-1]]
* [[Douglas O-2|O-2]]
* [[Dayton-Wright XO-3|O-3]]
* [[Martin XO-4|O-4]]
* [[Douglas World Cruiser|O-5]]
* [[Douglas O-2|O-6]]
* [[Douglas O-2|O-7]]
* [[Douglas O-2|O-8]]
* [[Douglas O-2|O-9]]
* [[Loening OL|O-10]]
* [[Curtiss Falcon|O-11]]
* [[Curtiss Falcon|O-12]]
* [[Curtiss Falcon|O-13]]
* [[Douglas O-2|O-14]]
* [[Keystone XO-15|O-15]]
* [[Curtiss Falcon|O-16]]
* [[Consolidated O-17 Courier|O-17]]
* [[Curtiss Falcon|O-18]]
* [[Thomas-Morse O-19|O-19]]
* [[Thomas-Morse O-19|O-20]]
* [[Thomas-Morse O-19|O-21]]
* [[Douglas O-2|O-22]]
* [[Thomas-Morse O-19|O-23]]
* [[Curtiss O-24|O-24]]
* [[Douglas O-2|O-25]]
* [[Curtiss Falcon|O-26]]
* [[Fokker XB-8|O-27]]
* [[Vought O2U Corsair|O-28]]
* [[Douglas O-2|O-29]]
* [[Curtiss XO-30|O-30]]
* [[Douglas O-31|O-31]]
* [[Douglas O-2|O-32]]
* [[Thomas-Morse O-19|O-33]]
* [[Douglas O-2|O-34]]
* [[Douglas Y1B-7|O-35]]
* [[Douglas Y1B-7|O-36]]
* [[Loening OL|O-37]]
* [[Douglas O-38|O-38]]
* [[Curtiss Falcon|O-39]]
* [[Curtiss O-40 Raven|O-40]]
* [[Thomas-Morse O-19|O-41]]
* [[Thomas-Morse O-19|O-42]]
* [[Douglas O-43|O-43]]
* [[Douglas YOA-5|O-44]]
* [[Martin B-10|O-45]]
* [[Douglas O-46|O-46]]
* [[North American O-47|O-47]]
* [[Douglas O-46|O-48]]
* [[Stinson L-1 Vigilant|O-49]]
* [[Bellanca YO-50|O-50]]
* [[Ryan YO-51 Dragonfly|O-51]]
* [[Curtiss O-52 Owl|O-52]]
* [[Douglas A-20 Havoc|O-53]]
* [[Stinson Voyager|O-54]]
* [[ERCO Ercoupe|O-55]]
* [[Lockheed Ventura|O-56]]
* [[Taylorcraft L-2|O-57]]
* [[Aeronca L-3|O-58]]
* [[Piper J-3 Cub|O-59]]
* [[Kellett KD-1|O-60]]
* [[Pitcairn XO-61|O-61]]
* [[Stinson L-5 Sentinel|O-62]]
* [[Interstate Cadet|O-63]]

|group2 = Tri-service sequence<br><small>(1962–present)</small>
|list2 = 
* [[Cessna O-1 Bird Dog|O-1]]
* [[Cessna O-2 Skymaster|O-2]]
* [[Lockheed YO-3 Quiet Star|O-3]]
* [[Wren 460|O-4]]((smallsup|1))
* [[de Havilland Canada Dash 7|O-5]]
* [[De Havilland Canada Dash 8|O-6]]

  ((Navbox|child
  | group1 = Related designations
  | list1  = 
* [[Grumman OV-1 Mohawk|OV-1]]
* [[North American Rockwell OV-10 Bronco|OV-10]]
* [[Pilatus PC-6 Porter|OV-12]]
  ))

|below = <sup>1</sup> Unconfirmed
))<noinclude>
((navbox documentation))
[[Category:United States Air Force aircraft designations navigational boxes]]
[[Category:United States tri-service aircraft designations navigational boxes]]
</noinclude>

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