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美国确定超音速运输机研究新目标美国的超音速运输机研究了作起始于1952年，几经周折，到1971年3月国会取消了超音速运输机计划。90年代，超音速运输机研究在美国重新兴起，其主要动因是NASA推出的高速研究计划（HSR）。HSR的本意在于探索日后工业界开发高速民用运输机（NSCT）
U.S. Determines New Target for Supersonic Transport Aircraft The U.S. supersonic transport aircraft was developed to study the supersonic transport aircraft plan that was canceled by Congress in March 1971 after several setbacks and by March 1971. In the 1990s, supersonic transport aircraft research revived in the United States, mainly due to the NASA’s High-Speed Research Initiative (HSR). HSR is intended to explore the future development of industrial high-speed civilian transport aircraft (NSCT)