Why would a Customer of size purchase a second seat knowing they can get a complimentary second seat at the airport?
Having a second seat purchased in advance allows us to account for the inventory need and greatly helps reduce the likelihood of an oversale situation (having more confirmed Customers waiting to board than seats on the aircraft). Also, there are a number of Customers who do not want to be approached at the airport or have a conversation with an Agent about their seating needs. These Customers of size prefer to know they have the number of seats they require, and we wanted to give them that choice. We will also refund all extra seat purchases, even if the flight oversells.