Lockheed Martin, the US aerospace and defence company that manufactures F-16 fighter aircraft, has been named the principal contractor.—AFP/file • Lockheed Martin picked as main contractor; $686m deal aims to extend fleet service life until 2040 • US Congress was earlier notified of the proposed sale, didn’t raise any objections WASHINGTON: A US military upgrade package for Pakistan’s F-16 fighter fleet, worth $686 million, has been cleared through a statutory congressional notification process. Lockheed Martin, the US aerospace and defence company that manufactures the F-16 fighter aircraft, and has long been responsible for its design, upgrades, and sustainment programmes for international operators, has been named the principal contractor for the proposed sale. The sale was processed under existing authorities provided by the Arms Export Control Act and annual appropriations laws. These provisions allow the executive branch to obligate and disburse funds once Congress has been formally notified and does no...