Boom Unveils Symphony Supersonic Engine(aviationweek.com)
aviationweek.com
Boom Unveils Symphony Supersonic Engine
https://aviationweek.com/aerospace/aircraft-propulsion/boom-unveils-supersonic-engine-partner-team
https://aviationweek.com/aerospace/aircraft-propulsion/boom-unveils-supersonic-engine-partner-team
Company description of "Symphony" engine: https://boomsupersonic.com/symphony
Claims 10% lower operating cost, use of 100% sustainable fuel