Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to-exceed $7,630,940,571 firm-fixed-price, fixed-price incentive (firm target), undefinitized modification (P00016) to a previously awarded advanced acquisition contract (N0001920C0009). This modification increases the ceiling to procure 129 Lot 15 aircraft, as follows: 49 F-35A aircraft for the Air Force; three F-35B aircraft and 10 F-35C aircraft for the Marine Corps; 15 F-35C aircraft for the Navy; 32 F-35A aircraft and four F-35B aircraft for non-U.S Department of Defense (DOD) participants; and sixteen F-35A aircraft for Foreign Military Sales customers, as well as 69 shipsets of technical hardware. Work will be performed in Fort Worth, Texas (57%); El Segundo, California (14 %); Warton, United Kingdom (9%); Cameri, Italy (4%); Orlando, Florida (4%); Nashua, New Hampshire (3%); Baltimore, Maryland (3%); San Diego, California (2%); Nagoya, Japan (2%); and various locations outside the continental U.S. (2%), and is expected to be completed in October 2024. Fiscal 2021 aircraft procurement (Air Force) funds in the amount of $2,162,537,083; fiscal 2021 aircraft procurement (Navy) funds in the amount of $1,538,490,483; fiscal 2020 aircraft procurement (Air Force) funds in the amount of $54,747,445; fiscal 2020 aircraft procurement (Navy) funds in the amount of $32,338,565; FMS funds in the mount of $693,338,015; and non U.S. DOD participant funds in the amount of $682,929,685 will be obligated at the time of award, $87,086,010 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.