Do your kids (or husband) complain when they have to kill time on an airplane? Here is a small building game that you can can take with you on board or wherever you are by easely storing it in your wallet since has the size of a credit card.
To build this small plane , you just need a sheet of paper to make the wings, and even that you can find anywhere as well, even cardboard,or parking ticket will do the job.
Unfortunately this credit card gadget is not yet available for sale, but you can print it if you have some knowhow of 3D printing. You can download the necessary files here.