Recall and hiring, just a guess...
I think at least 1/3 or more will bypass, at least at first. With 3 years to bypass after the most junior of almost 3000 pilots is recalled, that could be another 10 years. AA would have to start hiring off the street. Then after the 3years, or something in between, some more furloughees will accept recall with better relative senoirity than those hired off the street. Much like the AE flow through. However, the longer a pilot is off property, hopefully the better the position he/she is in at the current job. It may not be worth coming back at that point. I imagine it will boil down to the retirement and if you think it will not change and will be there when the individual pilot will be ready for retirement.
STL: was always a profitable hub for TWA. With DFW, ORD, and STL, the weather was usually good at one or two of those hubs for re-routing. At the time of the aqusition, DFW and ORD were stretched to the limits as far as capacity goes. After 9/11, demand dropped 20% - 30%. Total flights are still below 9/11 levels, but making come back with a different allocation. Remember the government limiting the AA and UA number of departures and the times when they left?
DFW-guy: don't plan a career based on what one airline might do. CAL would be a good choice if international is really what you would like to do. HOU wouldn't take that long to get, but they are stronger and more junior for the international out of EWR. Even if you got to AA, international out of DFW is very senior. Netjets or another fractional or OMNI might fit the bill for you.