What's the small seat is???

Please team tell me what is the small seat is? What's the standard for small seat? On business class and First class what seat should we arrange for that makes the seat not the small seat! If the Team don't have the Standard I believe what the Business and First Class allow to placement is the legal seat to arrange for the high class. What ever the How the real world work. It is legal in the game. So as to be the fair game to fair play, Please the Team or GM put the standard out for the reference。 

I have a brilliant idea. Maybe you should put really small seats in first class!!1!!1 more profitz omg!11