I think that there are some important factors to take into consideration:

1: Stability, Airline industry is very cyclical you can be top of the world to day and down and out tomorrow. American Eagle looks very stable they are wholly owned by AMR and don't have to worry about loosing contracts being undercut etc... Comair great airline but delta looks to be in trouble maybe they will emerge from bankcruptcy maybe they wont. ASA again another very good company but like comair they dont own there routes!!

2: Pay, Kid yourself if you want but you don't want to be living at home with your parents all your life so just because these companies have shiny jets doesn't mean you should go fly them for peanuts. (The rest of the pilot group will respect you if you hold out for a job with good pay)

3: Quality of Life, Minimum days off is the company unionised??? I don't care what people think of Unions Airline Pilots need them! Can you live at your base?? Is there any easy commute. Upgrade time!!!!!!!!! Very important unless you wnat to fly rjs for the rest of your life!!!