The original announcement has more information about this: https://boomsupersonic.com/flyby/post/introducing-symphony-the-sustainable-and-cost-efficient-engine-

The original announcement has more information about this: https://boomsupersonic.com/flyby/post/introducing-symphony-the-sustainable-and-cost-efficient-engine-for-overture https://boomsupersonic.com/flyby/post/introducing-symphony-t... It seems Boom designed some engine ideas and is now partnering with other companies to see if it can be built. This sounds a little like Magic Leap. Sell great ideas and then conclude it can't be made (yet).