airport relatives
People you keep seeing on a trip involving air travel: at check-in, in the security line, at starbucks, waiting at the gate, sitting three rows ahead of you, waiting for baggage claim, etc
See that guy in the flowered shirt? He sat in front of me and farted the whole trip. Yea, I saw him fixing his carry-on with duct tape in the mens room. Are those salt stains on his sweatpants? I think so. Well, you can't choose your airport relatives