The U.S. Air Force is investing more than $50 million to keep its U-2 flying indefinitely
The U-2 is a spy plane, easily recognizable from its gliderlike shape and stealthy black color scheme. The Air Force commissioned it from the Lockheed Corporation in the 1950s as a reconnaissance aircraft that could fly above 70,000 feet—an altitude then presumed to be beyond the reach of Soviet surface-to-air missiles. Today the U-2’s high-altitude…