By Tobias Carroll It’s been almost 20 years since the last time the Concorde flew across the Atlantic, bringing to an end the era of supersonic commercial travel. Or perhaps “bringing to a pause” might be more accurate, given the numerous plans floating around for successors to the Concorde. It isn’t hard to see why, in a world where people’s time is at a premium, some travelers might embrace paying more in order to engage in business or recreational travel faster than they currently do. On the other hand, the question lingers: is there enough of a demand to merit the kind of financial and tec…