Flight etiquette is seemingly something none of us can agree on. If you've ever flown in the Friendly Skies, then you know that it rarely goes smoothly. Unless you're in first class. Then you can probably disregard this. But otherwise, you're very aware of the inconveniences that come with flying in a fart tube including, attempting to fit your legs comfortably in the tightest spaces and then having them go numb halfway through the flight, silently fighting over the armrest, someone pulling out…