From the recent VP fltops news letters..... the most recent class New hires came from "Horizon, Air Wis, Express Jet, ANG" the class before that, Horizon, Virgin Am, ExpJet, Empire, USMC. The one before that Jan or early Feb. ExpJet, Southern, USN, Endevor, and Pinnacle. There are some newbies getting LAX and SEA base. I recently rode in the J/S with an ANC F/O that had quit AA mainline last year to come to AS.
I don't know what the code is to get hired. I have recommended 2 very qualified people that have all the squares filled and they have not gotten an interview in the last 2 years.