Interviewing with Skywest this month. I am a current CL-65 FO at another regional. Few questions to you current SW drivers.

Bases LAX, PHX, ORD, DTW

1) How long would it take to get one of the following bases?
2) How long will it take to hold a line?
3) How long is upgrade?
4) Which aircraft are flown and for which major?

Thanks for your help.