In the 1960s the arrival of the supersonic transport (SST) was seen as a logical conclusion. That urge concretized in the development and construction of two supersonic airliners: the Anglo-French Concorde and the Soviet Tupolev Tu-144. The Americans?, well, as usual, they thought “bigger” and bolder. Sadly, the American SST program due to technical and political problems suffered a protracted development until cancelled in the early 1970’s.
In this poor quality pic -sorry-, a representative of the iconic NAA company showing their 1963-64 proposals. Stunning designs; remember they had the XB-70 Valkyrie in their stables. To no avail, NAA was soon eliminated in favor of both Lockheed and Boeing.