Just wanted to point out that CO/NW offer a 50% bonus for their lowest tier elite, while most of the others offer less for their lowest level. Apologies if already mentioned, as I only scanned this thread--great topic. Many might argue that it's harder to use miles on CO, so the 50% doesn't matter, so it's arguable. However, I haven't had as many problems redeeming for standard (lower cost) awards as others.