13. Spy Planes

For more than half a century, the CIA and U.S. military have relied on a sinister-looking black jet to go deep behind enemy lines for vital intelligence-gathering missions. The most famous aircraft projects are Lockheed's U-2 "Dragon Lady" and SR-71 "Blackbird" reconnaissance planes. During the early years of the Cold War, the most effective way to gather strategic intelligence about the Soviet Union and its allies was manned overflight. Lockheed's U-2 was spectacularly successful in this role. More than 50 years after its first flight in conditions of great secrecy, the Lockheed U-2 still flies valuable reconnaissance missions around the globe.