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New York (CNN Money) -- Congress isn't expected to raise taxes as part of any 2014 budget deal, but it might hike some "user fees" the federal government charges businesses and individuals.

A likely possibility: An increase in a passenger security fee that industry lobbyists warn could add to theprice of plane tickets.

Lawmakers face a January 15 deadline if they want to replace some of the automatic spending cuts known as the sequester. But that will require making other spending cuts or raising revenue to preserve thesequester's intended savings.

Airline advocates argue that an increase in the security feeto reduce deficits would do nothing to strengthenairport securityor speed up long security lines.

Right now the passenger security fee per ticket is $2.50 for each leg of a trip. But the total fee to get to a destination is capped at $5.

Say you book a nonstop roundtrip to Chicago. You pay $2.50 on the way out and $2.50 on the way back. If you booked flights with stopovers each way, you'd pay $5 on the way out and $5 for your return home.

If Congress goes ahead with a hike in user fees, political analysts and the airline industry expect lawmakers would double the security fee to $5 per trip each way. That would effectively double the fee for nonstop flights, but leave the fee for multi-leg trips unchanged.

Related: Airlines rake in $27 billion in customer fees

It's not clear how much of the increase would be passed on to fliers.

"Each airline will take a different approach. It will manifest [either] as the passenger pays, the airline pays or a little bit of both," said Sean Kennedy, senior vice president for global government affairs at the trade groupAirlines for America.

Doubling the passenger security fee for nonstop flights could raise about $13 billion over the next decade if it went into effect immediately, or $11 billion if it started in 2015, said Marc Goldwein, senior policy director at theCommittee for a Responsible Federal Budget.

But that would only make up for some of thebudget cutsthat lawmakers are seeking to replace.

That's why analysts expect thatnegotiatorsalso may propose hikes in other user fees, as well as an increase in broadband spectrum sales, and higher federal worker retirement contributions, among other measures.

Raising users fees gives both parties a political out.

The Republicans can say that they guarded against any tax increases because higher user fees simply count as more revenue -- i.e., not an actual income tax increase on wages or investments.

And Democrats can say that they avoided deeper cuts in domestic programs as well as changes to Medicare and Social Security.

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