Lockheed Martin's secretive Skunk Works unit may have already finished making the radical hypersonic update of the long-retired Mach 3 SR-71 Blackbird spy plane. 

Jack O’Banion, Vice President of Strategy and Customer Requirements, Advanced Development Programs for Lockheed Martin, let slip at a conference the unmanned aircraft has already been made. 

Speaking at The American Institute of Aeronautics and Astronautics SciTech Forum, he showed a slide of a digital mockup of the craft, and said 'Without the digital transformation, the aircraft you see there could not have been made.'

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