United States, Sept. 29 -- Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $12,529,999,033 modification (P00015) to a fixed-price incentive (firm-target), firm-fixed-price, cost-plus-fixed-fee contract (N0001923C0003). This modification provides for the definitization of 148 Lot 18 aircraft, and adds scope for the production and delivery of 148 lot 19 aircraft, to include 40 F-35A aircraft for the Air Force, 12 F-35B and eight F-35C aircraft for the Marine Corps, nine F-35C aircraft for the Navy, 13 F-35A and two F-35B aircraft for F-35 cooperative program partners, and 52 F-35A and 12 F-35-B aircraft for Foreign Military Sales (FMS) customers. Work will be performed in Fort Worth, Texas (57%); El Seg...