According to travel experts, parents traveling on an airplane with kids should always have a carry-on bag with them that is filled with items they may need during their flight. Among the supplies that are typically recommended are snacks, wipes, a spare outfit, a lightweight jackets and age-appropriate forms of entertainment. I benefited greatly from following this advice when my girls were younger. But, my list of trip essentials never stopped there. I actually took several additional things with me when my family of four traveled together and none of them were ever shoved into a crowded overhead bin or stuffed under the seat in front of me. The things…