Southwest Airlines flew 11.7 billion revenue passenger miles (RPMs) in May 2018, an increase of 4.2% from the 11.2 billion RPMs flown in May 2017. Available seat miles (ASMs) increased 5.2% to 13.8 billion in May 2018, compared with May 2017 ASMs of 13.2 billion. The May 2018 load factor was 84.6%, compared with 85.4% in May 2017.

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