The accomplishment marks the longest flight for the $300 million X-51A technology demonstration program and, according to the Air Force and Boeing, the longest scramjet-powered hypersonic flight ever.

Trouble with a control fin on the sleek, scramjet-powered aircraft puts an abrupt and early end to the Air Force's attempt at a Mach 6 flight. Jon Skillings is an editorial director at CNET, where ...

Why is Christian Science in our name? Our name is about honesty. The Monitor is owned by The Christian Science Church, and we’ve always been transparent about that. The Church publishes the Monitor ...

WASHINGTON — U.S. Air Force officials are uncertain about the future of a hypersonic aircraft flight test program after the third of four experimental vehicles veered off course due to a “faulty ...

The U.S. military launched an experimental hypersonic aircraft on its swan song test flight Wednesday (May 1), accelerating the craft to more than five times the speed of sound in the longest-ever ...

After approximately 15 seconds of flight, the experimental aircraft designed to fly at six times the speed of sound was unable to maintain control during a test run Tuesday and was lost, the Air Force ...

The U.S. Air Force's $300 million, nine-year test program for a hypersonic plane ended on a high note this week, when the last of its X-51A Waverider vehicles made the longest flight of its kind. The ...

The second hypersonic test flight of Boeing's X-51A Waverider has ended prematurely with the craft failing to transition to full power. The X-51A Waverider broke the record for the longest ever ...

An experimental U.S. military drone built to fly at blistering speeds of up to 3,600 mph — six times the speed of sound — plunged instead into the Pacific Ocean just seconds into a test flight on ...

A Boeing X-51A WaveRider unmanned hypersonic vehicle achieved the longest air-breathing, scramjet-powered hypersonic flight in history May 1, flying for three and a half minutes on scramjet power at a ...

The X-51A Waverider flew today, and it flew fast. The 200 seconds of autonomous flight by the U.S. Air Force's X-51A set a duration record for an aircraft powered by a scramjet (short for "supersonic ...