Featuring six General Electric engines and an advanced delta-wing design, the XB-70 was an engineering marvel. However, the advent of surface-to-air missiles and intercontinental ballistic ...

XB-70 Valkyrie: The Mach 3 Bomber That Pushed Aviation ... Developers wanted a delta-wing jet plane to outrun and outfox Soviet air defenses while flying at 70,000 feet. While not an overall ...