The Boeing Phantom Ray unmanned airborne system sits atop a NASA Shuttle Carrier Aircraft (SCA), a modified Boeing 747. The SCA flights with Phantom Ray are being conducted under a Boeing-funded, commercial Space Act Agreement with NASA. Once Phantom Ray arrives at Dryden, it will undergo ground and high-speed taxi tests to prepare for its first flight.The Phantom Ray and the adapter together weigh approximately 30,000 pounds.