[header] How to avoid unnecessary expenses at the airport [title] Pack a few light snacks. [step] Load up on packaged foods that you can munch on during the flight, or devour a large meal that you know will hold you over until you land. That way, you'll be less tempted to make a stop at the food court, where the options tend to be quite pricey. 
If your appetite gets the best of you, seek out a vending machine or snack kiosk instead of a restaurant. [substeps] Items like chips, granola bars, mixed nuts and candy make perfect snacks for flying.