How do you know that an airline agent is trying to charge you much more than necessary to change a ticket? Two agents attempted that on me just yesterday, but they quickly realized they were messing with the wrong guy and retreated from their positions. The difference was thousands of dollars.

In my book, I explain why it helps to know what exactly you want before calling an airline, and more importantly, to know the outcome of an agent’s actions. I never trust agents to tell me how much I need to pay for anything — I call them simply to accomplish something I can’t do online. A couple of months ago, I issued a Business Class ticket for a client who flew the outbound portion but had to cancel the return. I called the airline to take him off that flight and said I wasn’t ready to rebook yet but would call back when I was…