Short of finally inventing teleportation systems, plane travel is still the fastest way to travel extremely long distances. However, it still has yet to reach its full potential. Supersonic planes were still in their infancy when the government pulled the plug because of their uncomfortable effects on people on land, the phenomenon more popularly known as Sonic Boom. That was more than half a century ago. NASA thinks that science and technology may have caught up enough to get the ball rolling again to build the world's next supersonic passenger jet, for now nicknamed the X-plane.