*Southwest Airlines<ref>https://www.2ndvote.com/business-entity/southwest-airlines</ref><ref>https://www.opensecrets.org/orgs/toprecips.php?id=D000000785&cycle=2016</ref><ref>https://www.southwest.com/html/southwest-difference/southwest-citizenship/environmental-initiatives/</ref><ref>http://investors.southwest.com/news-and-events/news-releases/2009/21-10-2009</ref> | *Southwest Airlines<ref>https://www.2ndvote.com/business-entity/southwest-airlines</ref><ref>https://www.opensecrets.org/orgs/toprecips.php?id=D000000785&cycle=2016</ref><ref>https://www.southwest.com/html/southwest-difference/southwest-citizenship/environmental-initiatives/</ref><ref>http://investors.southwest.com/news-and-events/news-releases/2009/21-10-2009</ref> |