Pitting Lockheed Martin’s SR-72 and the Tupolev PAK DA ... Russia argues that stealth is more important than speed. However, the US is focused on developing an aircraft that is stealthy but ...

In 2013, Lockheed Martin announced development of the successor to the SR-71 Blackbird spy plane. The SR-71 was capable of reaching speeds over three times the speed of sound, and the SR-72 is ...