![Technology Top Stories from Associated Press (AP) show](/assets/missing_small.png)
Summary: LOS ANGELES (AP) , The U.S. military is planning a fourth unmanned hypersonic flight in the wake of a failed attempt. The Air Force said Wednesday the test of an experimental X-51A Waverider will occur sometime next year. The aircraft is designed to reach six times the speed of sound after being released by a B-52 bomber.