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Summary

The Lockheed U-2, nicknamed “Dragon Lady”, is a single-engine, very high-altitude reconnaissance aircraft operated by the United States Air Force (USAF) and previously flown by the Central Intelligence Agency (CIA). It provides day and night, very high-altitude (70,000 feet / 21,000 meters), all-weather intelligence gathering.[1] The aircraft is also used for electronic sensor research and development, satellite calibration, and satellite data validation.

Sources

http://en.wikipedia.org/wiki/Lockheed_U-2