Maybe the full sized silk in wallet? I have one and I am amazed at how much can go inside that wallet including my iPhone! Haven't tried a boarding ticket though!
I actually use an agenda holder? I can't remember the name anymore... It fits 2 passports, and I normally leave the top open for boarding passes, and it's worked for me pretty well. Oh, it also has 3 card slots.
Just pulled out my Passport and tried it, fits in full size silken wallet with room to spare, but a boarding pass would have to be folded. I was researching the other day on line for this kind of travel combo and came across some options from Leatherology, great colors and several choices that would hold passport and boarding pass etc. Haven't ordered and am still looking but I've tagged the site.