Two large sized bookplates featuring aeroplanes - fun for keeping track of your kids' books! Just print onto sticker paper, or onto ordinary printer paper to use with a glue stick.
There is nothing like a bookplate at the front of a special book to give a child ownership - especially when the bookplate shows something that the child is interested in. Here's a collection of printable bookplates with a transport theme. You could print them onto full size sticker paper and then slice them apart.