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Perhaps “privately developed” is a more accurate description than “civil”?
Boom Technologies is also partially funded by US Air Force. https://www.popsci.com/technology/boom-supersonic-air-force-funding/
Huh, so not entirely private? Or publically funded and privately developed?
What about the Concorde? Government grants but technically done by private firms.
Also Bombardier in 2021 with their business jet demonstrator:
https://bombardier.com/en/bombardiers-flight-test-vehicle-breaks-sound-barrier
The difference that is significant is its quietness which the others were not
Are you sure you aren’t confusing the Boom XB-1 with the NASA X-59?
