Obese people have come out to complain that they are finding it difficult to fit into airplane seats, and are being charged excessively when they get seats.   In the United States for example, policies around plus-size travelers tend to vary from airline to airline.   Companies like United Airlines, ask “customers who require extra seating” to buy an additional seat in advance, while some airlines refund the purchase if one or more seats are available after takeoff. Some airlines …