To make Concorde (and to some extent the TU-144s) work we should add Supersonic demand. This is a 4th demand bar in market research, and it's worked out by dividing the daily Y passengers by daily C passengers and multiplying by F passengers. For example, the Supersonic demand from LHR- Hong Kong would be rougly 201 passengers. (1205/168*28=200.8)
Thoughts?