[From Hans] This is something I have done more, used my iPhone as the boarding pass. "IN 2007 Continental Airlines started testing what was then a novel technology: allowing passengers to receive an electronic boarding pass on their mobile phones. Four years later, it is finally gaining traction. Now most of the major carriers offer mobile boarding passes at many airports in the United States and some abroad. With a growing number of travelers carrying smartphones, the era of paperless boarding may have finally arrived. I recently tried a mobile boarding pass for the first time on a Delta flight out of La Guardia Airport, and had no problems checking in or getting through security and onto the plane. "