ANSWERS: 4
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Here is what I found. "The Mikoyan-Gurevich MiG-25, which first entered service in 1970 (prototypes were flown in 1964), features giant turbojet engines and vacuum-tube electronics. This aircraft is capable of reaching Mach 3.2" link: http://www.techeblog.com/index.php/tech-gadget/feature-the-world-s-fastest-fighter-jet-reaches-mach-3-2-with-video-
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The fastest jet fighter in the world is the MiG-31 "Foxhound" capable of speeds of Mach 2.83 (3,000km/h or 1,860mph) This aircraft is the successor to the MiG-25 "Mikoyan" http://en.wikipedia.org/wiki/MiG-31 http://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-25
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that mig 31 is the fastest sustained speed at afterburner sustained reported supercruise, without afterburner is the F22A, Mach 2.2.
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North American X-15 This aircraft has the current world record for the fastest manned aircraft. Its maximum speed was mach 6.70
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