(Editor's Note: This story has been updated with additional comments from an Air Force spokesman.) President Trump on Monday announced that a forthcoming "deal" to buy 90 F-35 Joint Strike Fighters would save $600 million, but program officials and prime contractor Lockheed Martin would not confirm the president's figures or the nature of the deal -- though it aligns closely with affordability plans the program has been discussing for months. Speaking to reporters at the White House this week,...