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True, but Delta owns a refinery. http://articles.philly.com/2015-04-17/business/61222460_1_monroe-energy-l-l-c-trainer-refinery-delta-air-lines http://articles.

• hga 11y ago
  To the extent that supplies their fleet, they're still dependent on others to supply the right grades of crude for it. As the second sentence puts it: Delta said the sharp drop in crude oil prices would translate into a $2.2 billion savings in jet-fuel costs in 2015.