DALLAS, April 5, 2013 /PRNewswire/ -(ENEWSPF)- Southwest Airlines Co. (NYSE: LUV) announced today that the Company flew 9.4 billion revenue passenger miles (RPMs) in March 2013, a 4.0 percent increase from the 9.1 billion RPMs flown in March 2012. Available seat miles (ASMs) increased 3.8 percent to 11.5 billion from the March 2012 level of 11.1 billion. The March 2013 load factor was 82.0 percent, compared to 81.8 percent in March 2012. For March 2013,…






