Delta, American, and United Just Raised Prices. What Will Southwest Do?

A Southwest Airlines airplane takes off at San Diego International Airport on Sept. 19 Photograph by Sam Hodgson/Bloomberg

Delta Air Lines raised its roundtrip fares by $4 to $10 for most of its domestic flights on Tuesday, one of the periodic increases airlines launch to test their rivals’ willingness to follow suit. (Yawn.) This hike, however, came a day after American Airlines formally became the world’s largest airline and new top player in the U.S.

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