Deb has an interesting question. She and her husband openly admit that they’re too large to fit in a single seat, so they purchase three seats when they travel by air. The problem, she writes, is that is that even when airline customers are happy to buy more than one seat, they are not actually granted access to multiple seats. Unmovable armrests and other barriers keep passengers of size from actually using the extra seat they have paid for. So, Deb wants to know: what’s a fat frequent flier to do?