Southwest, a No.4 airline by newcomer traffic, had a top forced bumping rate among vast U.S. carriers, holding scarcely 15,000 passengers off flights final year, or 9.9 per 100,000 passengers, down somewhat from 2015.
Article source: http://www.huffingtonpost.com/entry/southwest-overbooking_us_59036a09e4b05c39767ee8e5?section=us_travel