Investigation underway into rare, unsafe airliner roll experienced by a Boeing 737 Max CNNWhat is a Dutch roll? A look at the phenomenon that grounded a Southwest jet San Francisco ChronicleSouthwest Airlines Boeing 737 Max goes into “Dutch roll” during Phoenix-to-Oakland flight CBS NewsFAA is investigating how Boeing, Airbus jets may have ended up with counterfeit titanium. Here’s a timeline of the company’s mounting problems. Yahoo! Voices