Dennis Muilenburg started as an intern at Boeing in 1985 and never left. The aerospace company is America’s largest exporter, the Defense Department’s second-biggest contractor, and since Muilenburg became CEO, its annual revenue topped $100 billion for the first time. We visited the company’s headquarters in Chicago to talk with Muilenburg about biking 10,000 miles a year, his differences with the president, and why manufacturing in America today is “harder than it’s ever been.”