Cobi Lockheed SR-71The SR 71 Blackbird was an American reconnaissance aircraft that served in the United States Air Force from the 1960s to the 1990s. It was designed by Lockheed Martin and was one of the fastest aircraft in the world. Its maximum speed exceeded Mach 3 (over 3,700 km h), and thanks to its operational altitude of up to 26 km, it was difficult for anti missile defense systems to shoot down. The SR 71 had an advanced design, using titanium, which allowed