United States, Sept. 29 -- Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $52,116,731 firm-fixed-price, fixed-price-incentive, cost-plus-fixed-fee modification (P00028) to a previously awarded contract (N0001923C0003). This modification adds scope to incorporate engineering changes into the F-35 Lot 18-19 Air Vehicle production, including improvements and production incorporation of new capabilities for various aircraft variants for the Air Force, Marine Corps, Navy, F-35 Cooperative Partners and Foreign Military Sales (FMS) customers.Work will be performed in Palm Bay, Florida (61%); Fort Worth, Texas (23%); Nashua, New Hampshire (8%); San Diego, California (4%); Blackburn, United Kingdom (1%); Chel...