Well, I did a little research on the subject and it seems that there is both good and bad news for us big folk.

The good news is that while SW Airlines does in fact reserve the right to enforce this policy, in practice it has rarely been done.

The bad news is that it has already held up to a legal challenge. A judge ruled that SWA was acting within legal standards and that the burden of proof necessary for a discrimination claim had not been met. Of interest to me was that the case was not argued as a violation of ADA. I was under the assumption that obesity was treated as a disability and therefore equal access rules applied. Anyone know anything about ADA and the obese?