[silisili]

I've read, but never tested, that if you buy two seats and tell them you're overweight, they'd refund you one.

Obviously research yourself as needed, but remember seeing an article about that recently.

Still, no relief for taller passengers.

[pjot]

> You may contact us for a refund of the cost of additional seating after travel. If you prefer not to purchase an additional seat in advance , you have the option of purchasing just one seat and then discussing your seating needs with the Customer Service Agent at the departure gate. If it’s determined that a second (or third) seat is needed, you’ll be accommodated with a complimentary additional seat.

From their support page: https://support.southwest.com/helpcenter/s/article/extra-sea...

[jabroni_salad]

I have seen them doing that. They give the passenger a placard to put on the extra seat so nobody could sit in it.