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(CNN) - It's going to cost you a little more to fly the low-cost carrier Spirit Airlines.

The company says new federal regulations designed to protect consumers are forcing it to add $2 to the price of each ticket.

And Spirit's making it clear who it blames.

They airline calls the charge the "Department of Transportation Unintended Consequences Fee."

New DOT regulations allow passengers to change flights within 24 hours of booking, without paying a penalty.

Spirit complains this forces the airline to hold a seat for someone who may or may not want to fly, keeping it from selling the seat to someone else.

The move drew an e-mailed response from Transportation Secretary Ray LaHood.

He said that "Rather than coming up with new and unnecessary fees to charge their customers, airlines should focus on providing fair and transparent service."