The Lockheed SR-71 Blackbird high-altitude, high-speed reconnaissance aircraft is retired from SAC service in ceremonies at Beale AFB, Calif. SR-71 crews flew more than 65 million miles, half at speeds above Mach 3.
The KC-Z4, a blended wing body tanker concept being developed by startup JetZero, could fuel larger groups of aircraft at longer range to hold more targets at risk, company officials say.