From the top of their corporate website, there is a video explaining this: https://boomsupersonic.com/boomless-cruise https://boomsupersonic.com/boomless-cruis

From the top of their corporate website, there is a video explaining this: https://boomsupersonic.com/boomless-cruise https://boomsupersonic.com/boomless-cruise And from the top of their wikipedia page: "is expected to reach supersonic speeds without causing a sonic boom at ground level by taking advantage of a physics phenomenon known as mach cutoff" https://en.wikipedia.org/wiki/Boom_Overture https://en.wikipedia.org/wiki/Boom_Overture