I'm confused about a detail with Ultimate Rewards. We often fly Southwest and I know I can transfer UR points to use at Southwest. But it also says I'll get a 20% discount if I book on the UR site. I did a search of our next trip and Southwest didn't even come up in the results. So if I'm flying Southwest, is it possible to book from the UR site? And if I can, which is better: book Southwest from the UR site, or transfer the points and book directly with Southwest?