How Many Miles Do You Need for That Free Flight? Now It’s Up in the Air

If you think airline mileage programs are confusing, get a passenger load of the next big thing in “loyalty”
Photograph: Getty Images
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U.S. airlines are changing the rules of their frequent-flyer programs and, befitting air travel, being greeted with a measure of rage.

Amid strong travel demand, Delta and Southwest are now pricing loyalty awards more like all other tickets—“dynamically,” with regular changes in how many miles it takes to buy an award seat. It looks like United is next.