I recently sat next to a high-revenue, full-fare, high-powered attorney, UGS member who told me that the primary reason he flies United is that it is peanut-free. He has a young daughter with severe peanut allergies. He went on to tell me that when he flies with his family, they always fly in Y; I'm not sure why, but he believes that Y is more peanut-free than C or F. He said that he is always granted early boarding so that he can wipe down the seating area his family will be using.