Southwest Airlines flew 5.24 billion RPMs in March, up 12% over the year-ago period. Capacity climbed 11.9% to 7.11 billion ASMs and load factor gained 0.1 point to 73.7%. For the three months ended March 31, RPMs increased 12.3% to 12.24 billion. ASMs rose 10.1% to 20.23 billion and load factor improved 1.2 points to 65.4%.

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