Southwest Airlines flew 9.9 billion revenue passenger miles (RPMs) in April 2015, an 8.6% increase from the 9.1 billion RPMs flown in April 2014. Available seat miles (ASMs) increased 6.7% to 11.9 billion in April 2015, compared with the April 2014 level of 11.2 billion.  The April 2015 load factor was 83.1%, compared with 81.7% in April 2014. For April 2015, passenger revenue per ASM (PRASM) is estimated to have decreased approximately 2.0%, compared with April 2014. For the first four months of 2015, Southwest flew 35.8 billion RPMs, compared with 33.3 billion RPMs flown for the same period in

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