WOODLAND HILLS, Calif., 9 April 2011. Flight tests for the U.S. Air Force Research Laboratory's Automated Aerial Refueling (AAR) program showed that the Relative Navigation system from Northrop Grumman Corp. exceeded accuracy requirements. The objectives of the AAR program are to demonstrate critical technology to enable refueling of unmanned aircraft and develop tools to support airworthiness certification for integration with the existing Air Force tanker fleet.