Amount of international flights I've been on so far this year: 20ish, I think
Amount if times someone cared about my signature: 0

Only time there has been extra hazzle was when the airline questioned my C1/D visa as I didn't work for an airline. Took them a while to realize that ships also travel internationally.

Oh, and there was this time I had one of those DE9-RJ45 console cables in my backpack, and I had to explain what it was for during a routine inspection.