An employee prepares a Virgin America Inc. Airbus A320 plane for take off at San Francisco International Airport (SFO) in San Francisco, California, U.S., on Thursday, Nov. 6, 2014. Virgin America Inc., the seven-year-old airline partially owned by U.K. billionaire Richard Branson, is seeking as much as $320 million in an initial public offering in the U.S. Photographer: David Paul Morris/Bloomberg via Getty Images
