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One counter example is that Delta bought an oil refinery for this reason. https://en.wikipedia.org/wiki/Trainer_Refinery https://en.wikipedia.org/wiki/Trainer_R
by barney54 10y ago
One counter example is that Delta bought an oil refinery for this reason. https://en.wikipedia.org/wiki/Trainer_Refinery https://en.wikipedia.org/wiki/Trainer_Refinery