Well, there's the common fee, which is the AIF. If airports actually charge it as an AIF, it displays on the ticket. It's in full view of the person buying the ticket.
There are lots of buried fees. There's a fee they call the passenger facility charge, which doesn't show on the ticket. Airports charge that directly to the airline. Buried fees like that don't show necessarily on the day-to-day...or are not in the public's view.