This was achieved by a NASA experimental hypersonic aircraft called the X-43.
这是通过名为 X-43 的 NASA 实验性高超音速飞机实现的。
英语百科
Hypersonic flight
Hypersonic flight is flight through the atmosphere below about 90km at speeds above Mach 5, a speed where dissociation of air begins to become significant and high heat loads exist.