NASA's X-43A hypersonic demonstrator is gearing up for its second Mach 7 flight attempt next month, the outcome of which may determine whether the program will make a third flight attempt at Mach 10.

In 2004, the 12-foot-long, unmanned X-43A was the fastest powered air-breathing vehicle to date at Mach 6.8 in March and Mach 9.6 in November. Each record flight was just seconds long, yet in those ...

The Senate Appropriations Committee has approved funding for research on new technology that could one day allow planes to travel anywhere in the world within two hours. The $25 million research ...

LOS ANGELES (AP) - A tiny unmanned NASA "scramjet" soared over the Pacific Ocean Tuesday to demonstrate a radical new engine technology by attempting to fly at a record speed of about 7,000 mph, ...