Each of the kids have a travel backpack that I fill with items to keep them happy during travel. Before leaving for a trip, I always go to Walmart and buy their favorite snacks. I fill a gallon bag for each kid with their snacks and keep it in their backpack which they bring as their personal item (separate from carry-on.) I also add a portable charge and cord to each of their backpacks along with headphones. For the littles, I may add a coloring book or something little they can play with. Snacks and screen time can go a long way for your sanity!
Bonus: Bring a cheap, disposable water bottle to the airport and drink it before arriving so it can be stored in the backpacks. It can be filled once you get through security & will save you a small fortune. Airport snacks & water is insanely expensive, and if these get lost, it’s no big deal.