After a positive 2012, U.S. airlines have room to grow and are well positioned for a strong 2013, according to an analysis by Dahlman Rose & Co. This growth, however, will come mainly on the passenger side, with little or no benefit from cargo. The investment firm Dahlman Rose & Co points to a number of factors fueling growth for these airlines. Improving balance sheets, traffic in the second half of December that exceeded expectations, and current...