Silencing a sonic boom would help a Concorde replacement

Tomorrow, yesterday WHEN a British Airways Concorde travelling from New York touched down at Heathrow airport, in London, on October 24th 2003, supersonic passenger travel came to an end. Concorde was a technological marvel, but never a commercial success. Only 14 of them entered service. Yet the idea of building a successor has never quite gone away. Aircraft-makers review the idea from time to time. A number of groups are working on small executive jets intended to travel faster than the speed...