And yet again someone on HN spends 5 mins reading about a company and concludes that the company has

forgotten / misunderstood / miscalculated / is hiding

something entirely fundamental to their business model.

Look, this is a company with adults on board. It's not just 2-3 kids doing another CRUD app in a domain they are completely new to. It's engineers with education and long careers in aviation. I think they know better than most of us the size of engines, that planes use fuel and what it cost. I think they know the cost of insurance and maintenance and other cost components that go into flying at supersonic speed.