Really? Pretty much every ground job I've ever had I've had a set schedule that very rarely changed. I also haven't really worked too many weekends. When I was working full time ground support they generally had part timers work the weekends. I did work alot of holidays though since they put those out to bid, and you could make triple time!

Of coarse most of my line duty was on the midnight shift, from about 9-10 at night til 5-6 in the morning. This was my preferred shift as things where alot slower and more laid back, plus management rarely ever bothered us. Could be why they never screwed with my schedule too since no one else wanted to work it!