In my base they are calling from month off and days off Capts and FOs very often to fly. LTCs, CPTs and even FOs are leaving (10% approx in 6 months, overall). I joined just one year ago from another airline, and I'm also asking myself how are they managing to do it... A lot of new planes delivered every months... T&C will be only changed if they are forced to do it if you don't agree with them just leave, they say...