The NASA X-43 was an experimental unmanned hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of the X-plane series and specific
Pegasus rocket booster accelerating NASA's X-43A (dark object mounted on nose) shortly after ignition during test flight (March 2, 2004)
Artist's concept of X-43A with scramjet attached to the underside
NASA's B-52B launch aircraft takes off carrying the X-43A hypersonic research vehicle (March 27, 2004)
Full-scale model of the X-43 plane in Langley's 8-foot (2 m), high-temperature wind tunnel
The Boeing B-52 Stratofortress is an American nuclear-capable subsonic jet-powered strategic bomber. The B-52 was designed and built by Boeing, which has continued to provide support and upgrades. It
NASA X-43
…jet-powered aircraft on record at approximately Mach 9.6. A winged booster rocket with the X-43 placed on top, called a "stack", was drop launched from a Boeing B-52 Stratofortress. After the booster rocket (a modified first stage of the Pegasus rocket) brought the stack to the target speed and altitude, it was discarded, and the…
A B-52H from Barksdale AFB flying over Texas
XB-52 prototype on flight line (X-4 in foreground; B-36 behind). Note original tandem-seat "bubble" style canopy, similar to Boeing's earlier B-47 Stratojet.
Side view of YB-52 bomber, still fitted with a tandem cockpit, in common with other jet bombers in US service, such as the B-45 Tornado, B-47 Stratojet and Martin B-57 Canberra
B-52H Stratofortress undergoing maintenance to its rudder with its fin folded