Well Concorde couldn't make it to Seattle from London, so it would have had to do like London -> New York -> (subsonically) Seattle -> Tokyo which would have be

Well Concorde couldn't make it to Seattle from London, so it would have had to do like London -> New York -> (subsonically) Seattle -> Tokyo which would have been a pretty hard sell I think. Plus the Seattle -> Tokyo route in particular would have required a next generation plane.