NEWYou can now listen to Fox News articles! China just sent a clear signal about where it believes air travel is headed next. A Shanghai-based aviation company called AutoFlight has unveiled Matrix, now recognized as the world's largest flying car. This is not a concept image or a brief hover test. Matrix has already completed successful flight tests near Shanghai, bringing real size and real ambition to an industry still dominated by small prototypes. The launch also highlights China's push to dominate what it calls the low-altitude economy. That sector focuses on short-distance flights using electric aircraft to move people…