Even after Boeing’s SST was cancelled, McDonnell Douglas kept on with there own SST studies for an advanced Super Sonic Transport (AST) as noted in this Flight International article dated 18 December 1975. Their study of an AST (advanced supersonic transport) was designed to carry 237 passengers up to 4.400 nautical miles at a speed of Mach 2.2. The aircraft was to have had a NASA-designed "arrow" wing.
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