updated 8/21/2008 1:47:40 PM ET 2008-08-21T17:47:40

Frontier Airlines is the latest airline to announce it will start charging fees when certain customers redeem frequent-flier miles.

Frontier said Thursday that starting Sept. 15, it will add a $25 fee on EarlyReturns award tickets and $75 on EarlyReturns award tickets booked for travel within 14 days.

Some passengers are exempt from some fees, including frequent fliers with a certain amount of miles.

The Denver-based carrier, which filed for bankruptcy protection in April, is also raising the amount of miles it takes to earn a free domestic round-trip ticket to 20,000, from 15,000. Other redemption levels are increasing by between 5,000 and 10,000 miles.

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