When you’re at an airport, you’re kind of a captive audience. That’s all well and good, but unfortunately, the airport knows that just as much as you do. Now granted, there are some things you really can’t help but buy at the airport, especially if you’re stuck there for a long time (BTW, if you ever are, remember there are lots of free and cheap things you may be able to do while you’re waiting). But if you’re going to be at the airport for a so-called normal amount of time, and can plan ahead, DO IT. It’ll save you a bunch of money.