Development of the Lockheed supersonic transport has followed the basic philosophy that an advance in air travel in terms of speed and economics should be accompanied by similar advances in aeroplane safety and flying qualities. To achieve these objectives, Lockheed's SST design work has been concentrated for many years on the development of a fixed‐wing design. The present configuration—called a double delta—provides a simple high lift system with low wing loading, excellent low speed stability and control, and large favourable ground effects in landing, with inherent advances in operational simplicity and safety.
Heppe, R.R. and Englebry, C.R. (1967), "An account of the design philosophy of the Lockheed SST project", Aircraft Engineering and Aerospace Technology, Vol. 39 No. 1, pp. 25-38. https://doi.org/10.1108/eb034230
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