Originally Posted by HeyAussie
I only fly full 'Y' when work books that for me.

Lately I've been doing a bunch of transborder on UA (crediting to AC), mostly on 'B' class fares. Had great success talking my way into E+ on these even with no UA status.
You are entitled to E+ on UA when booked on a Y, B or M fare. I don't know if this applies if on an AC codeshare flight number or not, but most agents would not eb that adept, I don't think. At least not on the 3rd or 4th try!