回复1楼:梦里飞呀？

“We’ve already built and flown a full-scale flight demonstrator in the real world, and we broke records in doing it,” Will Roper told Defense News in an exclusive interview ahead of the Air Force Association’s Air, Space and Cyber Conference. “We are ready to go and build the next-generation aircraft in a way that has never happened before.”
Will roper是美国空军负责采购的副部级官员
这是中文版
https://mil.sina.cn/zm/2020-09-16/detail-iivhvpwy7019329.d.html

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人家保密不代表人家没有
The US Air Force has built and flown a mysterious full-scale prototype of its future fighter jet
By Valerie Insinna
Sep 15, 2020