High Quality Content by WIKIPEDIA articles! The Northrop Grumman X-47B is an American demonstration unmanned combat air vehicle (UCAV) which first flew in 2011. The X-47 project began as part of DARPA`s J-UCAS program, and is now part of the United States Navy`s UCAS-D (Unmanned Combat Air System Demonstration) program, which aims to create a carrier-based unmanned aircraft. Unlike the similar Boeing X-45, the development of the aircraft`s predecessor, the X-47A Pegasus, was company-funded.