When you combine the long, monotonous hours of an international flight and the boredom of being stuck in a marginally comfortable seat for that long, the munchies are sure to strike. Most long flights provide complimentary snacks and others that are available for purchase, but you'll be much happier if you bring your own. Bring a variety of snacks like fresh fruit, trail mix, jerky (hello, protein!), peanut butter packets, and even a little dark chocolate so you've got all your cravings covered. Don't forget gum to help your ears with the pressure changes during takeoff and landing.