Reposted from Answers.com
Air Speed Records depending on the type of aircraft:
Manned airbreathing jet aircraft: Lockheed SR-71 Blackbird — 3,530 km/h (2,194 mph), set in 1976
Unmanned Air-launched hypersonic scramjet: NASA X-43A –12,144 km/h (7,546 mph), set in 2004
Manned Air-launched jet aircraft (incapable of breathing air): North American X-15, 7,274 km/h (4,520 mph), set in 1967.
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