U.S. President-elect Donald Trump was scheduled to meet .....with the chief executives of two defense contractors he has criticized over project costs. Dennis Muilenburg, of Boeing Co, and Marillyn Hewson, from Lockheed Martin Corp, arrived at Trump's Mar-a-Lago resort where he is spending Christmas. ... Trump has complained about the companies in Twitter broadsides and speeches for costs he said are too expensive, sending defense shares tumbling. Trump has said Boeing's costs to build replacements for aging Air Force One planes - one of the most visible symbols of the U.S. presidency - are too high and urged the federal...