Spike Aerospace is a Boston-based aerospace company designing the S-512 'Supersonic Diplomat,' a business jet intended to cruise at Mach 1.6 — roughly 450 mph faster than today's civilian aircraft — while aiming for quieter, low-boom overland flight. The aircraft would carry around 12–18 passengers and is pitched at reducing transoceanic and cross-country flight times by about half. As of its 2025 relaunch the S-512 remains a pre-prototype design program: the company has flown small subscale demonstrators but not yet a full aircraft.
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