Dryden Flight Research Center: NASA's X-43A Hypersonic Aircraft Ready For Flight: "NASA has set Saturday, March 27, for the flight of its experimental X-43A hypersonic research aircraft. The unpiloted 12-foot-long vehicle, part aircraft and part spacecraft, will be dropped from the wing of a modified B-52 aircraft, boosted to nearly 100,000 feet altitude by a booster rocket and released over the Pacific Ocean to briefly fly under its own power at seven times the speed of sound, almost 5,000 mph.
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