Ten years after the Air Force retired the SR-71 spy plane, Lockheed Martin’s legendary Skunk Works appears to be back at work developing a new Mach-6 reconnaissance plane, sources said.The Air Force has awarded Lockheed’s Advanced Development Projects arm a top-secret contract to develop a stealthy 4,000-mph (6,437 km/h) plane capable of flying to altitudes of about 100,000 feet, with transcontinental range. The plan is to debut the craft around 2020.
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