Number 3: Lockheed YF-12.
This jet was an American interceptor prototype with a top speed of mach 3.35. It looked almost like the SR-71 Blackbird and featured three Air-to-Air missiles. The reason for it looking a lot like the SR-71 was because the SR-71 was based on the YF-12, and also because both of them had the same designer, the extremely famous Clarence “Kelly” Johnson. Only 3 YF-12’s were built but the program still made it into the history books with its “highest speed”, “highest altitude” (both of these were later surpassed by the Blackbird) and “biggest interceptor” records.
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