>>198556310 million for trip to space is one time fee. The thing with supersonic airliner or business jet is that bill to develop it is billions. Business jet would probably be fine with engines nicked from a fighter, but airliner definitely won't be so engine development is going to cost billions. Handful millionaires, even when if couple billionaires would join 'em, don't have enough money to fork upfront to economically uncertain project like supersonic airliner or business jet. There simply isn't enough guaranteed demand for supersonic plane to justify economic risks involved.
Boom lost its engine on moment Rolls-Royce told them fork over the money for engine development. Rolls-Royce made gigantic mistake with Boom, they were willing to do feasibility study new supersonic engine without asking them to pay for all related expenses. If they had done so, they would have never had any kind of engine proposal at all. What RR did wrong is giving any ounce of credibility to these photoshop peddlers.
