Translate foreign signs in place, augment plane tickets with realtime flight details, see products in your house before you buy them... just off top of my head.
I think the concept of “live” paper via AR will be much more popular than most expect. Tickets, like you mentioned, are a great example. Other things could be the ability to flip through different revisions of a printed document or the ability for multiple people to mark up and annotate the same paper document.