The Boeing Model 733 was the never-to-be-built US counterpart to the European Concorde and Soviet TU-144. Subsequent research is unclear whether the design started at a delta wing planform or started as a swing-wing that was eventually dropped due to increased weight and complexity. You can learn more here.

The Boeing Model 733 was the never-to-be-built US counterpart to the European Concorde and Soviet TU-144. Subsequent research is unclear whether the design started at a delta wing planform or started as a swing-wing that was eventually dropped due to increased weight and complexity.
You can learn more here.
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