Tragedy has struck one of the hopeful new companies trying to invent the future of aviation. On Monday an Icon A5 crashed next to Lake Berryessa in northern California. The disaster killed Icon lead engineer Jon Karkow and his colleague, Cagri Sever. We don't yet know the cause of the crash. The National Transportation Safety Board will be investigating that. CEO Kirk Hawkins published the following statement on the company's Facebook page. I flew in an A5 two years ago when Icon brought the aircraft to New York for media test rides on the Hudson River. It is a gorgeous...