[comebacknewt]

No, but OTOH, postage is so much per unit weight. Seems to me that airlines should charge based on sum of the passenger's weight and that of the passenger's baggage

Good point. Plus, what Southwest is doing is like the Post Office saying, "Some packages will cost more than others, but we can't tell you exactly what the cutoff will be. We are going to leave that up to each individual postal clerk".

Can you imagine the uproar that would take place if that occurred?

[Britton J Wingfield]

You are correct that they should have a definitive standard based on girth. They can measure my waist before boarding all they want.