Originally Posted by
SkiAdcock
Again, well said & why the UA folk aren't happy re: CR1s and SWUs. Also I go to Europe a lot & usually the delta between a non-SWU fare & a SWU-fare is minimal, sometimes as little as $50 & sometimes $200. But at least Europe bound rarely above that. So SWUs aren't 'worthless'.
Funny you should use the world "delta", because on Delta the delta is ofter $1k or more, as the fares you can upgrade can be a scant couple hundred dollars less than discount C.
Current fares are no guarantee of future fares. NW had great upgrade fares pre-merger that all pretty much went away without the fare classes changing - M fares just went up a thousand dollars or two.