Junior base is MDW. 3 kinds of reserve; "B" is a 12 hour call out, "A" is a 2 hour call out, and there is also "H", but that has never been used. "H" basically stands for "hotel", if you are put on reserve "H" you will be paid per diem, even if you are in your base, and the company will pay for your hotel, even if you are in your base. The caveat is that it is a 30 minute call out from positive contact to hotel lobby report (or 60 minutes to airport if you decide to stay at home/crashpad). If you have a reserve B line, you can only be upgraded to "A" a total of 6 times in the month. If you are on a reserve A line, you get 14 days off instead of 12, and I believe that if you are on a reserve A or B line you can only be upgraded to "H" three times in a month, but I am not at all sure about that since I am never on reserve. I think most recent new hires are getting off of reserve in just a few months, since there are some fairly senior people who live in their base and just bid reserve instead of a line. Kind of schedule a new hire can expect depends on the plane you get, 737 pretty much all domestic stuff, 757 domestic and international, L-10 get extra pages in your passport because you are gonna see the world.