Transonic
Area of flight between subsonic and supersonic
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Who needs windows when you can have superefficient transonic passenger flight? That seems to be the reasoning behind Otto Aviation's Phantom 3500 jet aircraft that dumps the portholes in favor of super-laminar flow to lose weight and burn less fuel. -
NASA and Boeing have effectively cancelled the X-66 Transonic Truss-Braced Wing (TTBW) concept demonstrator aircraft. Officially described as a "pause," development of the thin-wing airplane is being halted in favor of ground-based testing.