The Lockheed U-2, nicknamed “Dragon Lady“, is a single-engine, very high-altitude reconnaissance aircraft operated by the United States Air Force and previously flown by the Central Intelligence Agency. It provides day and night, very high-altitude (70,000 feet / 21,000 meters), all-weather intelligence gathering. The aircraft is also used for electronic sensor research and development, satellite calibration, and satellite data validation. [Source: Wikipedia]
This is an awesome video that demonstrates just how capable technology and man are. A related article is the recent post “YouTube Movie: First Orbit” .