Airlines are taking in less money from bag fees than they did two years ago, but they're making up for it by adding charges for a slew of extras including getting a decent seat.

The government reported Monday that U.S. airlines raised $3.35 billion from bag fees in 2013, down 4 percent from 2012. That's the biggest decline since fees to check a bag or two took off in 2008.

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Some passengers use airline credit cards or earn elite frequent-flier status that lets them avoid the fees, which are usually $25 to $35 on domestic flights. Others carry their bag on board and fight for space in the overhead bins.

The bag-fee figure is part of airline financial information that is being released by the U.S. Department of Transportation.

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