When traveling, whether it's for business purposes between states or a long-distance trip to the chilly alpine slopes of Switzerland, it's necessary to adhere to airline etiquette. The story below is an account of a frustrated traveler. The original poster (OP) had just returned home to Seattle from Florida. In the story that follows, OP describes his interaction with an entitled couple who attempted to steal his designated seat. They tried to claim the seats as their own at first, but when tha…