• Home
• Prior to 1919
• Army Signal Corps, August 2, 1909 to April 6, 1917
• American-Built Airplanes of World War I, April 6, 1917 to November 11, 1918
• American Expeditionary Force (A.E.F.) aircraft from the French Government
• American Expeditionary Force (A.E.F.) aircraft from the British Government
• American Expeditionary Force (A.E.F.) aircraft from the Italian Government
• Post-War, November 11, 1918 to September 1919
• Type O: Foreign-Built Pursuit Aircraft
• Type I: Pursuit, water-cooled
• Type II: Pursuit, night
• Type III: Pursuit, air-cooled
• Type IV: Pursuit, ground attack, 1922
• Type V: Two-seat pursuit
• Type VI: Ground attack, 1920-1922
• Type VII: Infantry liaison
• Type VIII: Night observation
• Type IX: Artillery observation
• Type X: Corps observation
• Type XI: Day bombardment
• Type XII: Night bombardment, short range
• Type XIII: Night bombardment, long range
• Type XIV: Trainer, air-cooled
• Type XV: Trainer, water-cooled
• Ambulance, 1919-1924
• Messenger
• Pursuit, special
• Racer
• Seaplane
• Transport
• Attack, 1924-1948
• Bomber
• Light Bomber, 1924-1926
• Medium Bomber, 1924-1926
• Heavy Bomber, 1924-1926
• Unified bomber sequence, 1926-1962
• Bomber, long range, 1935-1936
• Missiles
• Cargo, 1924-1962
• Drone
• Aerial Target
• 1940-1941
• 1942-1948
• Aerial Target (Model Airplane), 1942-1948
• Controllable bomb, 1942-1945
• Target Control, 1942-1948
• Unified sequence, 1948-1962
• Electronic (modified aircraft)
• Glider
• Assault Glider, 1942-1944
• Bomb Glider, 1942-1944
• Cargo Glider, 1941-1948
• British-Built Cargo Gliders, 1941-1948
• Fuel Glider, 1930-1948
• Powered Glider, 1943-1948
• Training Glider, 1941-1948
• Unified sequence, 1948-1955
• Sailplane, 1960-1962
• Gyroplane, 1935-1939
• Fighter, Multiplace
• Pursuit, Biplace
• Pursuit, British-built
• Observation
• Observation, 1924-1942
• Observation amphibian, 1925-1948
• Liaison, 1942-1962
• Reconnaissance
• Reconnaissance-strike, 1960-1962
• Trainer
• Advanced Trainer, 1925-1948
• Basic Combat, 1936-1940
• Basic Trainer, 1930-1948
• Primary Trainer, 1925-1948
• Foreign-Built Training and Communications Aircraft, 1925-1948
• Unified sequence, 1948-present
• Convertiplane, 1952-1962
• Army, 1956-1962
• Airplane, Cargo, 1956-1962
• Airplane, Observation, 1956-1962
• Airplane, Research, 1956-1962
• Flying Platform, 1955-1956
• Helicopter, Cargo, 1956-1962
• Helicopter, Observation, 1956-1962
• Helicopter, Utility, 1956-1962
• Helicopter, Experimental, 1956-1962
• Vertical Takeoff and Landing Research, 1956-1962
• Unified System, 1962-present
• Airship
• Anti-Submarine Warfare
• Anti-Submarine Warfare Helicopter
• Attack
• Attack Helicopter
• Fixed-Wing Gunships
• Bomber
• Cargo
• Cargo Helicopter
• Drone
• Electronic Warfare
• Electronic Warfare (Modified Aircraft)
• Experimental, 1948-present
• Fighter
• Glider
• Helicopter
• Laser
• Observation
• Observation Helicopter
• Patrol
• Reconnaissance
• Reconnaissance (Converted Aircraft)
• Tanker
• Trainer
• Utility, 1955-present
• Utility Helicopter
• Vertical and Short Take-off and Landing Aircraft
• Un-designated foreign aircraft operated by the United States

Helicopter, Observation, 1956-1962

• HO-1 - Sud-Ouest
• HO-2 - Hughes Aircraft
• HO-3 - Brantly
• HO-4 - Bell (redesignated OH-4A avant-garde 1962)
• HO-5 - Fairchild Hiller (redesignated OH-5A forward-looking 1962)
• HO-6 - Hughes (redesignated OH-6A fashionable 1962)

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