Air Wis has 2 reserve situations and a third, Long Call Duty.
Standard reserve is a two hour call out to check in for a flight. The company issues pagers to all reserve pilots and F/As. The company cannot mark against you if you're stuck in traffic or there is a bad snow storm or anything that is out of the control of the pilot... Sitting in the middle of a lake three hours from Chicago doesn't count. Once on the trip, you have to call Crew Sked once the trip is over to be released from duty. Reserve lines are built to 12 days off and 75 hours pay. Actual time on duty is about 15 hours and the hours can rotate throughout the clock. Most reserve times start between 6 and 9 a.m. You take what they give you, but negotiation is possible. (I only had one reserve day that had me on reserve on the back side of the clock. That's with about 9 months total reserve on two different airplanes.)
Ready Reserve: Usually two lines of RR per bid period per base... I don't know (I don't think that is) Atlanta has any RR lines. Hours are 9 a.m. to 5 p.m. I believe this can change, not sure. You get a private room at the airport that has a comfy chair, cable TV, phone and a line for internet connection. If this cannot be done, the company gets you a hotel room to spend the day. The lines are built for 14 days off, 75 hours pay and Per Diem for time spent at the airport on Ready Reserve.
Long Call Duty is actually built into Build Up Lines and isn't technically a reserve assignment. LC works like this: You have a line that has 4 days off at the beginning of the month followed by say 4 days of LC and then 4 days off. The first day of Long Call (LC) is on Monday. The company has to notify you of a trip by 6 p.m. Saturday if they need you to work. (It is also the pilot's responsibility to contact Crew Sked if the pilot hasn't heard from them.) If by Saturday 6 p.m. the Company doesn't have a trip for you on Monday, you're released until Tuesday. So Sunday night you call Crew Sked and see if they need you Tuesday. This works out GREAT for commuters. Again, it's a line, built to at least 75 hours and 12 days off. Not being used for a LC day does not go towards your days off.
S.