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Ask HN: Old US documentaries about aviation and X planes

I remember watching some old US documentaries, in color, about the x plane prototypes and aeronautics in general, but I can't remember the name. Thanks

hindsightbias 5y ago
https://www.youtube.com/watch?v=NNiZG_edpes https://www.youtube.com/watch?v=NNiZG_edpes https://www.youtube.com/watch?v=RlS8HNQ94bc https://www.youtube.com/watch?v=RlS8HNQ94bc