...stage of a spaceplane designed for ‘safety soon’ is likely to be the first use of space to bring in airline-like operations. Spacecab ‘proper’ consists of the lower stage carrying a reusable upper stage in place of the attached passenger module. This...
... required design changes would all be straightforward and much of the technology pioneered by Concorde could be used. The Spacecab upper stage could be either a passenger module carrying about 20 people that remains attached for a suborbital flight...