Delta now second-largest U.S. airline, passing United

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Delta is now the second largest U.S. airline, having edged ahead of United in 2015.

Last week, Delta announced that it flew 209.6 billion revenue passenger miles last year. United said Monday that its count for 2015 was 208.6 billion.

The revenue passenger mile is an industry standard that factors in the number of passengers an airline transports and the distance those passengers travel.

Delta leapfrogged United by growing its revenue passenger mileage count by 3.3%, more than double United’s 1.6% growth. In 2014, United recorded 205.6 billion revenue passenger miles compared to Delta’s 202.9 billion.

Delta is still second in size to American Airlines, which announced Tuesday that it flew 223 billion revenue passenger miles in 2015, up 2.4% from a year earlier.

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