In order to prepare for our plane ride to Missouri, I made a "briefcase" of projects for the kids.
I gave each child one of those big pocket folders with the 3 sides enclosed and the flap and elastic strap that goes around--I have no idea what they are really called. I had filled these with various papers, stickers, pens, post-its, etc.
However the smartest thing I did was put back the $1 velvet picture/markers for Ashton and invest in the $7 Color Wonder Coloring Book of Disney Princesses.
On the plane, I realized the investment paid off far more than $6-worth peace of mind. She could color and I did not need to hover.