PALMDALE, CA -- Northrop Grumman subsidiary Scaled Composites has unveiled a new concept for the Model 437, an unmanned aircraft that officials hope could have a future as part of a broader family of systems or serve as a candidate for the Air Force's Skyborg program. Revealed at Northrop’s Palmdale site, the concept is derived from the Model 401 that Scaled Composites announced in fall 2017 following the prototype’s first flight -- an aircraft built for an undisclosed customer that...