Guppy Dude, I was holding most weekends off in MDW (lived in base and was willing to fly weekday reserve) after my one year anniversary. Of course, I still fly a lot of weekends by choice if the money is good enough.
Hired in March 04, I worked the first Christmas and got the second one off. Holidays largely depend on what day of the week they fall on; if Christmas is on a Saturday the Junior guys are hosed. If it's on a Wednesday, they might have a shot at it because the senior guys can't get both weekdays AND weekends off as well.