Getting hungry while traveling is inevitable, but don't let the travel industry pick your pocket. Plan ahead and bring travel-friendly snacks to avoid buying the often mediocre food available at the airport or aboard the plane, where it might sell for more than triple the normal retail price. Consider Transportation Security Administration rules when packing, opt for foods that will stay fresh without refrigeration, and be courteous to others by avoiding foods that are smelly or require lots of fussing to enjoy. When traveling internationally, be sure to declare all food and check customs regulations for the country you're entering, which may not allow items such as fresh fruit.
If you do find yourself stuck without a snack, here's Where to Find a Good Meal at Every Major U.S. Airport.