Delta passes United to become No. 2 US airline

Delta Air Lines Inc. passed United Continental Holdings Inc. to become the second-largest airline in the U.S., topping its rival for the first time since a series of mergers changed the industry landscape.

Delta is now second to American Airlines Group Inc. in terms of airline traffic.

In 2015, Delta recorded 209.6 billion revenue passenger miles, a measurement that multiplies the number of passengers by the distance flown. United recorded 208.6 billion revenue passenger mile.

American has not yet released its traffic numbers for December or all of 2015, but it appears poised to stay on top.

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