Southwest Airlines Co. flew 11.9 billion revenue passenger miles in June, an increase of 3.7 percent from the 11.5 billion RPMs flown in June 2016, the company reported today.

Available seat miles also increased 3.8 percent to 13.6 billion in June from 13.1 billion last year, Dallas-based Southwest (NYSE: LUV) reported.

The June 2017 load factor, or percentage of seats filled, was 87.4 percent, which was comparable to the record June 2016 performance.

The company released its June, second quarter…