The events of 9/11 as they unfolded through actual audio.
MQ-4C Triton Flight Testing
Northrop Grumman Corporation and the U.S. Navy have completed nine initial flight tests of the Triton unmanned aircraft system (UAS), marking the half-way point in a process called envelope expansion. During envelope expansion, the test team validates the aircraft's ability to operate at a range of altitudes, speeds and weights. The flights are taking place at the company's manufacturing facility in Palmdale, Calif. The Triton test team accomplished endurance flights up to 9.4-hours at altitudes up to 50,000 feet. The aircraft also performed doublets, a maneuver that tests the aircraft's ability to recover from small perturbations in its flight path caused by turbulence.