Originally Posted by
3Cforme
ashill and javabytes, pile on if you want, but somebody doing a Silver-level volume of flying with Delta isn't likely to be earning SWUs as an American Airlines EXP. Less than EXP (100K miles, 100 segments, or 100K EQP) and AA has flyers buying stickers for domestic upgrades, even.
I didn't say anything about SWUs on either Delta or American, and neither did the OP. We both talked only about upgrading with miles. The OP asked (indirectly) if it's possible with other airlines to upgrade cheap fares; I was the first to say yes.