Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to exceed $320,000,000 cost-plus-fixed-fee undefinitized modification (P00020) to a previously awarded advanced acquisition contract (N0001920C0009). This modification adds scope to provide non-recurring engineering in support of the production of one F-35A, one F-35B, and one F-35C new flight science test aircraft to replace aging flight science test aircraft for the Air Force, Marine Corps, Navy, and non-U.S. Department of Defense (DOD) participants. Work will be performed in Fort Worth, Texas (30%); El Segundo, California (25%); Warton, United Kingdom (20%); Orlando, Florida (10%); Nashua, New Hampshire (5%); Nagoya, Japan (5%); and Baltimore, Maryland (5%), and is expected to be completed in December 2027. Fiscal 2022 research, development, test and evaluation (Navy) funds in the amount of $11,083,062; fiscal 2022 research, development, test and evaluation (Air Force) funds in the amount of $11,083,058; and non-U.S. DOD funds in the amount of $4,882,683 will be obligated at the time of award, $22,166,120 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.