The Mk-II Aurora rocket-powered suborbital spaceplane has been cleared for unlimited-speed test flights at an altitude of up to 80,000 ft - Dawn Aerospace The Mk-II Aurora suborbital spaceplane took to the skies last year for its maiden flight with a rocket engine. Now Dawn Aerospace has been give the official nod from New Zealand's Civil Aviation Authority to undertake test flights at unlimited speeds. "This unlocks the next major performance milestone for the Mk-II vehicle, namely supersonic flight," said Stefan Powell, CEO of New Zealand's Dawn Aerospace. "To the best of our knowledge, this would be the first privately...