A Navy deal for an unmanned plane is the latest won by a unit of the defense contractor, the region's second-largest private employer.With a bulbous head and plank-like wings, the aircraft resembles a lumbering whale. And its seven-word, 49-letter name -- Broad Area Maritime Surveillance Unmanned Aerial System -- is a whopper. But the award last month of a Navy contract to build the hulking, robotic patrol plane, nicknamed BAMS, could not have come at a better time for Northrop Grumman Corp. and, in particular, its military aircraft business headquartered in El Segundo. Flying highThe contract, potentially worth nearly $4...