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What is the weight limit a person must exceed to be required to pay for an extra seat?
Most airlines do not have a set weight limit that requires you to purchase an extra seat. They will require you to purchase an extra seat if they determine you can not properly fit into one seat. Some airlines do not even have a policy set in place; they just make a case by case determination when you are checking in for your flight. A good rule of thumb is to contact the airline you are flying with and ask them as airlines policies can vary.