Back in my day (2012 that is) half of our group got invited for sim on day 2. Don't know how many of us actually passed but i did and flew for them for a few years before moving on greener pastures. The only reason i would go back if I'd be out of a job now just to get current and recent again then probably would bail on the first occasion for something better. But that said i doubt if they'd hire me. As far as i know they don't take people who worked for them before even though I've left under good terms with notice served and no outstanding bonds, whatsoever. Getting a letter of recommendation out of them was a pain in the a*s though.