With NASA test pilot William H. Dana at the controls, the North American X-15 makes the type’s 199th and final flight, completing 10 years of flight testing at Edwards AFB, Calif. The airplane reaches a speed of Mach 5.04 and an altitude of 250,000 feet.
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.