From Airfare watchdog:
In the first three quarters of last year, U.S. airlines made almost half a trillion dollars in baggage and change fees alone. It seems like there's a fee for everything these days. (Actually, there sort of is.) Figuring out which airline to book with and what the true cost of your travel will be is sort of like playing Guess Who? (but not nearly as fun). Need help? Let us introduce you to the brand new Comprehensive Airline Fees Guide, which comes in an easy-to-read PDF format. Here you'll find every major fee charged by every major domestic carrier. The best part? It won't cost you a dime.