Well Colin, you got a lot of dumb, and predictably silly, answers to a good question. I, too, have wondered why airliners have that unique smell. My best guess is that it is mostly the carpet flooring and the upholstery used on the seats and whatever fire-retardant properties they must have. Perhaps a bit of aviation fuel smell might be mixed in there too because the doors are often open to the outside during turnaround where the smell of av gas is clearly present. Usually unique smells are a combination of several odors that combine to a make distinct odor all its own. I doubt that the food or lavatories play any significant part in that world-reknown cabin smell that is, really, only detected upon first boarding a plane. I believe it is mostly the upholstery.
P.S. I think "Virgin Atlantic" meant to say flatulation, not flagellation. You must forgive him, he's studying English as a second language.