Skylon could fly high enough to moot sonic boom issues, but I think you're right about lack of market demand for transportation. I think aerospace folks may und

Skylon could fly high enough to moot sonic boom issues, but I think you're right about lack of market demand for transportation. I think aerospace folks may underestimate how continued advances in communication networks will erode demand for travel of all forms, let alone prompt travel. Of course the military will always be giddy about dropping bombs on whatever poor soul they want as promptly as possible...