When on reserve at ASA and Eagle, do they have hard days off or are they floating days off?

How easy is it to pick up open time and to manipulate your sked at ASA and Eagle?

I ask because it seems that reserve at Xjet isn't bad at all. It seems they have hard days off and picking up open time is not that hard. I'll be a commuter for any of these companies and so hard days off will be a huge plus.