Even with all the technology in the world, the laws of thermodynamics hold. Going faster raises friction losses requiring either a smaller plane or a larger amo

Even with all the technology in the world, the laws of thermodynamics hold. Going faster raises friction losses requiring either a smaller plane or a larger amount of fuel. Either way, the price goes up. SST will never supplant subsonic transport on a large scale level, even accounting for the elimination of sonic booms.