For a 5-year-old in 2026, your "survival kit" should focus on engagement and comfort. First, bring a fully charged tablet pre-loaded with offline movies and games, paired with high-quality child-sized headphones to prevent "sound bleed" into other rows. Second, pack a variety of low-mess snacks (like granola bars, crackers, and grapes) in a "snackle box," as airline food is often unappealing to young children. For activities, bring a "new" toy they haven't seen before, plus washable markers and a mess-free coloring book like "Water Wow." For comfort, a small travel blanket and a neck pillow can help with napping. Crucially, bring an empty leak-proof water bottle to fill after security—drinking during takeoff and landing helps their ears pop. Finally, always pack a complete change of clothes (for both the child and yourself) in your carry-on in case of spills or motion sickness, which are common at 30,000 feet.