I think most people don't realize SWA does not charge extra to obtain an extra seat due to size, disability, or large service animals. You just book 2 seats for yourself and use your name plus XS in the middle name space. After your flight you can call and get a refund on that extra seat. You can actually ask for an extra seat at the airport for free, but some people don't feel comfortable doing that. Classy move, SWA! 🙂
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