ST. MARTIN, Miss. - Northrop Grumman Shipbuilding has a $23 billion backlog of business and nine ships to be delivered within the next year. That’s according to president Mike Petters, keynote speaker at the Jackson County Economic Development Foundation's Spring Investors Meeting. Housing and insurance costs remain the biggest challenges for the company locally, Petters said. (Source: Mobile Press-Register, 03/27/09)