crewing controller's to crew ratio.
Just for your info - i work for an scheduled/weekend charter airline where our crewing controller's all do 12hr day and night shift's most of the time without a break - we only have 1 crewing controller on duty all the time !! and they are responsible for overseeing 680 crew operating from 11 bases from around the UK and France.
So it's not just EZY that have to do this......