Hi!
When I interviewed, the lead guy asked a TON of systems questions on the airplane we were flying (or had flown last, in my case). I've heard that this isn't typical from other ACA pilots, but in my case he went into a lot of detail on his questions.
THey were also VERY thorough on the 10-year background check (dates to the exact day,etc.), more so than any other airline I've interviewed at.
I think ACA is an excellent regional, and I'd be flying for them now if they hired me.
Good luck to you!
CLiff
GRB