When I first saw the boarding pass invitations, doing searches on-line, I knew that I wanted to make my own. Instead of them being our invitations though, we opted instead to use them as our save the dates. Since we are having an Old Hawaii theme, we also knew we wanted the boarding passes to look vintage.
In order to make these I started searching all over for graphics with a vintage feel. The two places I have had the most luck finding these is Etsy and iStock. On Etsy, you can find a ton of vintage graphics that I think have been scanned in from old books. iStock is full of stock photos and lots of vintage inspired retro graphics. They have both been able to provide us with many graphics that we have needed for all of our wedding paper.