With news of additional airline baggage fees coming out almost weekly (and the increased scrutiny over the size of carry-on bags), I was glad to see a new chart created by Kayak.com. In it, they list all of the additional baggage fees that don't get factored into the ticket price for almost two dozen airlines, including the ones making headlines: American ($15/first bag), United ($15/first bag), and Spirit ($15/first bag online, $25/first bag at gate). But then they go a step further: Listing the costs for snacks, pets, unaccompanied minors, and legroom (they list $5 per leg for US Airways, but we're going to assume that's for each leg of your flight). As you're pricing your ticket, it's good to know that if you're planning to send little Billy or Suzie off across the country with their pet Rex, a snack, and an extra bag, it's going to tack on about $257 more to what your ticket costs. Ouch.
While Kayak admits that they try to keep the chart updated as best they can, they also link to all of the airline websites, so you can check them out and ensure their charges are up to date. For more ideas on how to avoid fees, check out this article in SmartMoney, which encourages you to embrace the middle seat and start small when packing your bags, among several other travel tips.