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- cross-posted to:
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SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i…::undefined
It might even be from before then. I could swear I saw this copypasta back on the GameFAQs message board in the early 2000’s.