The Lockheed SR-71 Blackbird is a truly unique aircraft. This great video highlights the stranger aspects of hypersonic flight and the engineering obstacles which needed to be overcome to make the SR-71 reach speeds in excess of Mach 3 in 85,000 ft.
As of today, its successor the Lockheed Martin SR-72 „Son of Blackbird“ has not yet taken flight – even though in cinemas and the Microsoft Flight Simulator the Lockheed Martin Darkstar has surpassed Mach 10 at least once. 😉