I have some experience with UA's p.s. service, and don't always find it a top-notch product. Plus the lowest economy fare with a Sunday evening return now tends to be sky-high (like $750 to $800), so I can't justify paying the fare and upgrading. I'm looking at award travel, therefore it's time to investigate AA and DL. Any recent experience with AA's F or C products, or DL's Business Elite? DL availability at the medium award tier (still 80K pesos return) is way better than AA or UA saver a month or two out.