True, but Delta owns a refinery. <a href="http:&#x2F;&#x2F;articles.philly.com&#x2F;2015-04-17&#x2F;business&#x2F;61222460_1_monroe-energy-l-l-c-trainer-refinery-delta-air-lines" rel="nofollow">http:&#x2F;&#x2F;articles.philly.com&#x2F;2015-04-17&#x2F;business&#x2F;61222460_1_mo...</a>