Republic chief test pilot Carl Bellinger makes the first flight of the XF-91 Thunderceptor jet/rocket hybrid at Muroc AFB, Calif. This unusual aircraft has variable incidence wings of inverse taper design (wider at the tips than at the roots).
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.