(Editor's Note: This story has been updated with a statement from the F-35 Joint Program Office as well as comments from Lockheed Martin executives during the company’s second-quarter earnings call.) After months of prolonged negotiations, Lockheed Martin and the F-35 Joint Program Office have struck a "handshake" deal on the next production lots for the fighter aircraft. Reached Monday, the lot 15-17 agreement includes 375 jets, according to the JPO -- some 100 platforms fewer than the current production...