Southwest Airlines flew 12.2 billion revenue passenger miles (RPMs) in June 2018 , an increase of 2.6% from the 11.9 billion RPMs flown in June 2017. Available seat miles (ASMs) increased 3.2% to 14.1 billion in June 2018 , compared with June 2017 ASMs of 13.6 billion. The June 2018 load factor was 86.9%, compared with 87.4% in June 2017.
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