Enlarge / Boeing CEO Dennis Muilenburg gives a keynote speech during the SAE Aerotech Congress on September 22, 2015 in Seattle, Washington. Stephen Brashear/Getty Images reader comments 3 Share this story Further ReadingMusk’s Mars moment: Audacity, madness, brilliance—or maybe all threeOn Tuesday, a week after Elon Musk's big Mars reveal in Guadalajara,...