United Airlines is making big changes to its frequent-flier program.
Right now awards are based on the number of miles traveled.
But going forward they will be based on the cost of the flight.
That's going to benefit the biggest spenders, people who buy last-minute flights and first-class seats.
But it's not good news for price-conscious fliers.
Other carriers like JetBlue and Southwest have already made the switch to rewards based on flight cost.
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