Last year, SFA had ERT for all season pass holders 7 days per week during the peak season.  Each morning one area of the park would open an hour early for season pass holders.  This didn't always include a coaster.  For example, on Saturdays the water park opened early.  But, on Sunday it was SROS which explains why I usually went on Sunday.  It was also nice since you were already in the park at the official opening time and could grab a couple rides on other coasters before the lines built too much.