Jun 112012
An artists impression of the National Aero Space Plane by United Technologies/Pratt & Whitney, ca. 1989. P&W was seeking to win the contract to build not the airframe, but the scramjet propulsion system. From a brochure found in the NASA HQ historical archive.
I thought that the scramjet propulsion system was integrated within the airframe and therefore would be manufactured by the airframe manufacturer.
The inlet would be integral to the airframe, but the actual goodies inside the scramjet would be engine-manufacturer-manufactured. Compare with the highly integrated propulsion system on the sr-71.