[supernova87a]

Maybe someone here knows, but I'm always skeptical of any such news where there's not a single numerical figure in the story about the cost or operating difference. What is even the order of magnitude of fuel or operating cost improvement envisioned from these new designs? 10%? 30%

Similarly when any story is written about biofuels for example ("airline <x> demonstrates passenger flight using biofuels"), but the article doesn't quote a single dollar figure on the cost per gallon, you know it's just another story that comes and goes every year, but no significant new progress has been made towards actual sustainable/scaled possibilities.