If you're confused about which airlines are charging for what, Smartertravel and Kayak can help.

The editors of SmarterTravel.com, Airfarewatchdog.com, and SeatGuru.com have teamed up to bring you this Ultimate Guide to Airline Fees, a one-stop reference chart for every major fee from every major domestic airline. To download the chart, visit: http://www.smartertravel.com/blogs/today-in-travel/airline-fees-the-ultimate-guide.html?id=2623262

Kayak.com has also prepared a fee chart, available at http://www.kayak.com/airline-fees