According to Wikipedia: > Southwest integrated AirTran's fleet of Boeing 737-700 series aircraft into Southwest Airlines brand and livery, and the Boeing 717 f

According to Wikipedia: > Southwest integrated AirTran's fleet of Boeing 737-700 series aircraft into Southwest Airlines brand and livery, and the Boeing 717 fleet was then leased out to Delta Air Lines starting in mid-2013 Same as Alaska Airlines getting rid of the A320s they got by acquiring Virgin America. (Although they're in the same predicament again by acquiring Hawaiian).