Prevent in-flight meltdowns with these kid-tested diversions.

Crayons, markers, coloring books, paper, pencils, scotch tape, and children’s safety scissors are invaluable, as are playing cards, books, music players, and books on tape. Travel games are a bonus, but beware of loud gizmos that rattle the passengers in front of you. Wrap a few inexpensive trinkets to hand out at desperate moments. Gifts don’t have to be elaborate—the act of opening is often entertainment enough.