回复53楼:美国6代机的技术验证机,美国空军已经证实在2020年就首飞了
On September 15, 2020, then-U.S. Air Force acquisition executive Dr. Will Roper announced that the Air Force had flown a full-scale flight demonstrator as part of the NGAD program.
https://news.usni.org/2022/06/24/report-to-congress-on-air-force-next-generation-air-dominance-program
当然,距离量产型号首飞还有很久,只相当于歼20的2001号,技术上差了一代
我觉得中国这个并非NGAD的同级产品,而只是JH-20