The third X-43A hypersonic research aircraft, attached to a modified Pegasus booster rocket, was taken to launch altitude by NASA's B-52B launch aircraft from the NASA Dryden Flight Research Center at Edwards, CA, on November 16, 2004.
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The third X-43A hypersonic research aircraft, attached to a modified Pegasus booster rocket, was taken to launch altitude by NASA’s B-52B launch aircraft from the NASA Dryden Flight Research Center at Edwards, CA, on November 16, 2004. About an hour later the Pegasus booster was released from the B-52 to accelerate the X-43A to its intended speed of Mach 10.November 16, 2004NASA Photo / Carla Thomas› X-43A Project Description