Hard snack foods are the best choice. Though airlines typically provide travelers with a bag of peanuts or pretzels, it may not be enough to assuage your pangs of hunger. Bring your own nuts, pretzels, chips or jerky.
Dry cereal in a zip-top snack bag is a perfect in-flight snack for children. Mix in raisins or other dried fruit for a healthy vitamin boost.
For those who need a heartier snack, sandwiches are acceptable food items, but go easy on the mayonnaise and vinaigrette. Liquid or sauce on your sandwiches may prompt additional screening. To get around this, carry your condiments and sauces in serving containers less than 3 oz. each in the 1-qt. zip-top bag allowed for carry-on liquids. Single-serving condiment containers can be found at your supermarket.
Carrot sticks, celery, broccoli and other crunchy veggies are healthy and convenient. Store them in a zip-top bag and stow away in your carry-on luggage.
Fliers with a sweet tooth can bring their favorite cookies, brownies and candy items. Sweets with a liquid or gel filling may be subjected to additional screening or disallowed at the checkpoint.