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Delta Air Lines is one of the four carriers that controls majority of the US aviation market (the carriers account for more than 60% of the domestic market share). This development followed a spate of mergers in the industry during the early part of this century. Delta, the second airline company to have joined the coveted S&P 500 Index, commands more than 17% share of the domestic market. Bulk of this Atlanta-GA based carrier’s revenues are recognized from its airline segment. Evidently, 99.8% of the $47-billion amount generated in 2019 came from this unit. Balance is represented by the refinery segment, which operates for the benefit of the airline division by providing it with jet fuel from its own production and agreements with third parties.