SmashMouth

Passengers beware: More airline fees are on their way.

Another airline is promising to change the way we fly by offering cheap base fares but then adding on a bevy of additional fees. Passengers flying Frontier Airlines will now have to pay extra to place carry-on bags in the overhead bin or for advance seat assignments.

The move comes as the Denver-based airline tries to transform itself into a fee-dependent airline, similar to Spirit Airlines or Allegiant Air — the only other U.S. carriers to charge such fees. Frontier already charges $1.99 for a soda or water on its flights, a fee it added on July 1.

Frontier says that in exchange for these new fees, it is lowering its base fare by an average of 12 percent. The new charges apply to tickets purchased on or after Monday.

Frontier carries 8.4 million passengers a year, about 1 percent of the overall traffic flown by U.S. airlines.

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