Orbitz Worldwide, an online travel company enabling leisure and business travelers to research, plan, and book travel products, filed for IPO Thursday. The company had originally gone public in December 2003 at $26.00 per share, and then been acquired in September 2004 by Cendant Corporation at $27.50 per share. In August 2006, Cendant's travel distribution businesses were acquired by The Blackstone Group. Morgan Stanley, Goldman Sachs, Lehman Brothers, and J.P. Morgan are the bookrunners on the deal. No terms have been announced yet.