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Trip time requirements between points on earth can be reduced by use of hypersonic aircraft if the range is sufficiently large so as to minimize the effect on average speed of the time of acceleration and deceleration. ...The study encompasses consideration of the propulsive performance of a hypersonic ramjet design featuring lift augmentation. Particular attention is given to the influence of geometry, equivalence ratio, diffuser recovery characteristics, and boundary layer bleed on this performance. ...The results of the study indicate that present state-of-the-art in propulsion, aerodynamics, insulation, cooling, and structures can provide a hypersonic airbreathing transport capability. A 700,000 lb configuration could transport the above payload 3600 nautical miles with a fuel reserve adequate for descent and landing techniques similar to those used in present transport operation.