Los Angeles-based Northrop Grumman has won a major $3.8 billion contract to maintain and service the US Air ForceÔÇÖs fleet of KC-10 aerial refueling tankers. Northrop will take over from Seattle-based rival Boeing, who currently holds the contract for servicing the aircraft, in January. Boeing has been providing a 24-hour service, seven days a week on the fleet since 1998.


