(Complements of BillShrink)
Here’s a excellent picture illustrating the current fee structure of all major airlines based in the U.S. One airline definitely stands out (Hint: Starts with ‘South’ and ends with ‘west’):
With the economic downturn, airlines have been pretty aggressive with adding fees so this graph may not stay relevant very long.
Kayak has an excellent reference for fees across all airlines which is updated on a regular basis. I’ve attached a snapshot of the table as an example (Click on the thumbnail to get a readable picture).
It’s always a good idea to stay up-to-date on the fees so you can make the right decision for yourself and your clients.