Humans are a basically civilized species. We know not to go barefoot in restaurants, treat our friends’ living rooms like landfills or nap on the shoulder of our office cubicle mate. And yet, as soon as we step inside an airport or onto a plane, our manners seem to vanish. Perhaps it’s the delirium of travel or the belief that everyday rules do not apply to vacations, much like calories don’t count on holiday and foreign currencies aren’t real money. Or maybe there has never been a canon for proper passenger behavior — until now.