I have a LAX-IAH-SJO flight this Sunday and my LAX-IAH cleared the EUA. However, even though my IAH-SJO flight shows R/RN > 0, I am not upgraded (I called CO yesterday and was told that the "sweep" will happen midnight last night and there's nothing they can do to upgrade me).

As far as I know, the "sweep" only happens once a day and it's usually in 24/48/72/96 etc. hours prior to your departure time. All my flights are marketed and operated by CO, so there shouldn't be any out of sync problems. How do I make sure that I am on the upgrade list or get upgraded since it has been showing R/RN > 0 for the past few days!

Sometimes, having faith in the system just doesn't work because computer says no!