My wife and I are traveling on US in Confirmed 1st Class IAD-CLT-SAN on Sunday, 11/13. We are both US3.

Are there 1st/Preferred lines for security as well as for check-in?
And, as the IAD-CLT leg is an RJ, with no 1st Class, are we still eligible to use the 1st Class lines?
Do USX flights use the Z-terminal? Anyone who has flown from there lately have a report?

Our flight is at 330pm, Super Shuttle pickup in Crystal City is 1250pm. Enough time?