i've been watching this a&e show "airline" with much interest this year and last night on the WN forum I asked a WN-specific question, but now I'd now ask the question again as it pertains to the rest of the major carriers.

as you may be well aware, WN may occasionally require their "passengers of size (P.O.S.)" to purhcase another seat in the interest of the comfort of the passenger's neightbors. My question is twofold:

1) do any of the other majors enforce a policy of having to purchase another seat at the gate if the agent deems you a P.O.S?

2) if you do buy a second seat because of your horizontal proportions, either by choice or by obligation, are you rewarded double the frequent flyer program credit because you are buying and (presumably) sitting in two seats? it would seem like a logical request but i don't know if the airlines would honor such a request. given the nature of this situation, i wonder if there's even official policy on most airlines.

thanks everyone!