My thanks for the links to the articles, too, now that I've finally had the chance to sit down and read them.

If I were running an airline or hotel, though, I would hope that this is exactly the sort of thing that my loyalty scheme managers were reading. Although not all of the supportable propositions would necessarily translate into viable options in any given real world situation, I'd hope that they'd be keeping abreast of underlying theory and research as part of their jobs.