NASA gearing up for supersonic X-planes

NASA is preparing to put in the sky an array of new experimental aircraft — known as X-planes. (Source: NASA)
The US space agency is preparing to put in the sky an array of new experimental aircraft — known as X-planes and intended to carry on the legacy of demonstrating advanced technologies that will push back the frontiers of aviation.
Called “New Aviation Horizons”, NASA’s renewed emphasis on X-planes was announced as part of the US budget for the fiscal year t