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Concept
Reconnaissance aircraft
Summary
A reconnaissance aircraft (colloquially, a spy plane) is a military aircraft designed or adapted to perform aerial reconnaissance with roles including collection of (including using photography), signals intelligence, as well as measurement and signature intelligence. Modern technology has also enabled some aircraft and UAVs to carry out real-time surveillance in addition to general intelligence gathering.
Before the development of devices such as radar, military forces relied on reconnaissance aircraft for visual observation and scouting of enemy movement. An example is the PBY Catalina maritime patrol flying boat used by the Allies in World War II: a flight of U.S. Navy Catalinas spotted part of the Japanese fleet approaching Midway Island, beginning the Battle of Midway.
Aerial reconnaissance#History
Prior to the 20th century, machines for powered and controllable flight were not available to military forces, but some attempts were made to use lighter than air craft. During the Napoleonic Wars and Franco-Prussian War, balloons were used for aerial reconnaissance by the French.
In World War I, aircraft were deployed during early phases of battle in reconnaissance roles as 'eyes of the army' to aid ground forces. Aerial reconnaissance from this time through 1945 was mostly carried out by adapted versions of standard fighters and bombers equipped with film cameras. Photography became the primary and best-known method of intelligence collection for reconnaissance aircraft by the end of World War II.
World War I also saw use of floatplanes to locate enemy warships. After the battle of Jutland demonstrated the limitations of seaplane tenders, provisions were made for capital ships to carry, launch, and recover observation seaplanes. These seaplanes could scout for enemy warships beyond the visual range of the ship's lookouts, and could spot the fall of shot during long range artillery engagements. Observation seaplanes were replaced by helicopters after World War II.
Official source
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