I have an ET (UA award) reservation (DUR-ADD-LAX). I tried plugging the ET reservation confirmation code into the ET website 'Manage My Booking'. It cannot find it. The UA reservation shows as ticketed and confirmed, but I was hoping to verify this via ET's website and maybe select seats. Are there other methods to do this? I have had some success plugging these into 'Checkmytrip' or other reservations system specific sites. However, I don't know what system ET uses (Sabre maybe?).

Any thoughts? Thanks!