No matter how old you are, air travel can be tough. Parents of older children may be surprised that a typically well-behaved preteen can regress to toddlerlike whining on a long flight. Keep older kids happy with a selection of gadgets they can use on the plane. Consider splurging on a portable DVD player, or pack a laptop or tablet so your kids can watch movies or shows onboard. Bring along a selection of movies, or let them download a few favorites before you board the plane. If your children like to read, have them pack a book or two in their carry-on, or download an audiobook to their MP3 player or mobile phone. Handheld video games and cell phone apps can also keep older children and teens entertained on a flight.